Mature grotworm

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This article is about level 98 Grotworms. For other types of Grotworms, see Grotworm (disambiguation).
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Grotworm icon.png

Mature grotworms are monsters that can be found on the bottom level of the Grotworm Lair. They have slow, but accurate and hard-hitting magic and melee attacks. However, magic attacks are only used on players outside of melee range, similar to monsters such as metal dragons. It is possible to safespot them using the pillars if you stand far enough back from them. Lower-level players are recommended to bring high healing food such as monkfish or sharks. Ranged/magic would require Protect from Magic/Deflect Magic if using safe spots. The magic attack has a short range, so flashing your prayer when out of its range can help conserve prayer points. Despite their ranged weakness, a player with 70+ melee stats should have little trouble killing them efficiently, even without the use of prayer.

Using high level ranged gear such as Armadyl and using a bunyip will reduce the need for prayer potions/flasks. The occasional Shark drops will reduce the need for food, and ranged gear will mean little damage from the mature grotworms' magic attack while ranging.

If a player tries to set up a cannon within the Grotworm Lair, they will receive a message saying: "The damp air would prevent your cannon operating." This does not prevent hand cannons from working, however.

Some players may find it useful to bring runes to cast High Level Alchemy on the items dropped by the grotworms, as adamant and rune salvage are common drops. The profit of using this spell on some of these items is greater than banking and selling them. Alternatively, players could disassemble the drops for Invention experience and materials.

Locations[edit | edit source]

Drops[edit | edit source]

100% drop[edit | edit source]

Charms[edit | edit source]

Nothing
1Gold charm.png
1Green charm.png
1Crimson charm.png
1Blue charm.png
87–88%3%1–2%8–9%0.5–0.7%
Represents a 90% confidence range based on a sample of 14,800 kills.
1 item is dropped at a time.
Add data to the log (requires JavaScript).

Main drop[edit | edit source]

  1. ^ Estimated based on 55,659 kills from the RuneMetrics drop logging project.

Tertiary drops[edit | edit source]

  1. ^ Estimated based on 55,659 kills from the RuneMetrics drop logging project.

Rare drop table[edit | edit source]

This monster has access to the rare drop table.
Luck-enhancing items such as a ring of Wealth or luck of the Dwarves are not required to access the table.
Rare drop table.png Rare drop table:
Rare drop table
Item Members Quantity Rarity GE price High alch value
Coins_250.png: RS3 Mature grotworm drops Coins with rarity Common in quantity 250-500CoinsF2P icon.png250–500Common250-500250-500
Uncut sapphire.png: RS3 Mature grotworm drops Uncut sapphire with rarity Common in quantity 1Uncut sapphireF2P icon.png1Common90215
Uncut emerald.png: RS3 Mature grotworm drops Uncut emerald with rarity Common in quantity 1Uncut emeraldF2P icon.png1Common2,41430
Uncut ruby.png: RS3 Mature grotworm drops Uncut ruby with rarity Common in quantity 1Uncut rubyF2P icon.png1Common2,55960
Uncut diamond.png: RS3 Mature grotworm drops Uncut diamond with rarity Common in quantity 1Uncut diamondF2P icon.png1Common7,335120
Uncut diamond.png: RS3 Mature grotworm drops Uncut diamond with rarity Rare in quantity 45-55 (noted)Uncut diamondF2P icon.png45–55 (noted)Rare330,075-403,4255,400-6,600
Loop half of a key.png: RS3 Mature grotworm drops Loop half of a key with rarity Common in quantity 1Loop half of a key (m)P2P icon.png1Common15,0970
Tooth half of a key.png: RS3 Mature grotworm drops Tooth half of a key with rarity Common in quantity 1Tooth half of a key (m)P2P icon.png1Common15,2720
Uncut dragonstone.png: RS3 Mature grotworm drops Uncut dragonstone with rarity Uncommon in quantity 1Uncut dragonstone (m)P2P icon.png1Uncommon12,357600
Uncut dragonstone.png: RS3 Mature grotworm drops Uncut dragonstone with rarity Rare in quantity 45-55 (noted)Uncut dragonstone (m)P2P icon.png45–55 (noted)Rare556,065-679,63527,000-33,000
Dragon longsword.png: RS3 Mature grotworm drops Dragon longsword with rarity Common in quantity 1Dragon longsword (m)P2P icon.png1Common57,95760,000
Off-hand dragon longsword.png: RS3 Mature grotworm drops Off-hand dragon longsword with rarity Common in quantity 1Off-hand dragon longsword (m)P2P icon.png1Common57,59560,000
Dragon spear.png: RS3 Mature grotworm drops Dragon spear with rarity Rare in quantity 1Dragon spear (m)P2P icon.png1Rare35,09937,440
Battlestaff.png: RS3 Mature grotworm drops Battlestaff with rarity Rare in quantity 180-220 (noted)Battlestaff (m)P2P icon.png180–220 (noted)Rare558,720-682,880756,000-924,000
Rune javelin.png: RS3 Mature grotworm drops Rune javelin with rarity Rare in quantity 5Rune javelinF2P icon.png5Rare9251,870
Huge plated rune salvage.png: RS3 Mature grotworm drops Huge plated rune salvage with rarity Uncommon in quantity 1Huge plated rune salvageF2P icon.png1Uncommon38,73840,000
Huge plated rune salvage.png: RS3 Mature grotworm drops Huge plated rune salvage with rarity Rare in quantity 18-22 (noted)Huge plated rune salvageF2P icon.png18–22 (noted)Rare697,284-852,236720,000-880,000
Shield left half.png: RS3 Mature grotworm drops Shield left half with rarity Rare in quantity 1Shield left half (m)P2P icon.png1Rare64,03666,000
Dragon helm.png: RS3 Mature grotworm drops Dragon helm with rarity Uncommon in quantity 1Dragon helm (m)P2P icon.png1Uncommon58,43760,000
Rune arrowheads.png: RS3 Mature grotworm drops Rune arrowheads with rarity Common in quantity 113-137Rune arrowheadsF2P icon.png113–137Common16,385-19,865678-822
Onyx bolts.png: RS3 Mature grotworm drops Onyx bolts with rarity Very rare in quantity 135-165Onyx bolts (m)P2P icon.png135–165Very rare1,024,650-1,252,3501,104,165-1,349,535
Water talisman.png: RS3 Mature grotworm drops Water talisman with rarity Rare in quantity 68-82 (noted)Water talismanF2P icon.png68–82 (noted)Rare290,292-350,058136-164
Earth talisman.png: RS3 Mature grotworm drops Earth talisman with rarity Rare in quantity 68-82 (noted)Earth talismanF2P icon.png68–82 (noted)Rare8,092-9,758136-164
Raw lobster.png: RS3 Mature grotworm drops Raw lobster with rarity Common in quantity 135-165 (noted)Raw lobsterF2P icon.png135–165 (noted)Common49,680-60,72022,950-28,050
Raw shark.png: RS3 Mature grotworm drops Raw shark with rarity Uncommon in quantity 225-275 (noted)Raw shark (m)P2P icon.png225–275 (noted)Uncommon484,200-591,80040,500-49,500
Big bones.png: RS3 Mature grotworm drops Big bones with rarity Uncommon in quantity 68-82 (noted)Big bonesF2P icon.png68–82 (noted)Uncommon15,640-18,8600
Dragon bones.png: RS3 Mature grotworm drops Dragon bones with rarity Rare in quantity 180-220 (noted)Dragon bonesF2P icon.png180–220 (noted)Rare340,020-415,5800
Drakolith stone spirit.png: RS3 Mature grotworm drops Drakolith stone spirit with rarity Uncommon in quantity 25-35Drakolith stone spirit (m)P2P icon.png25–35Uncommon12,700-17,780Not alchemisable
Necrite stone spirit.png: RS3 Mature grotworm drops Necrite stone spirit with rarity Common in quantity 2Necrite stone spirit (m)P2P icon.png2Common5,352Not alchemisable
Phasmatite stone spirit.png: RS3 Mature grotworm drops Phasmatite stone spirit with rarity Uncommon in quantity 25-30Phasmatite stone spirit (m)P2P icon.png25–30Uncommon23,450-28,140Not alchemisable
Phasmatite stone spirit.png: RS3 Mature grotworm drops Phasmatite stone spirit with rarity Common in quantity 2Phasmatite stone spirit (m)P2P icon.png2Common1,876Not alchemisable
Necrite stone spirit.png: RS3 Mature grotworm drops Necrite stone spirit with rarity Rare in quantity 25-30Necrite stone spirit (m)P2P icon.png25–30Rare66,900-80,280Not alchemisable
Runite stone spirit.png: RS3 Mature grotworm drops Runite stone spirit with rarity Common in quantity 3Runite stone spiritF2P icon.png3Common5,178Not alchemisable
Orichalcite stone spirit.png: RS3 Mature grotworm drops Orichalcite stone spirit with rarity Rare in quantity 25-35Orichalcite stone spirit (m)P2P icon.png25–35Rare9,850-13,790Not alchemisable
Grimy torstol.png: RS3 Mature grotworm drops Grimy torstol with rarity Uncommon in quantity 90-110 (noted)Grimy torstol (m)P2P icon.png90–110 (noted)Uncommon441,090-539,1100
Grimy snapdragon.png: RS3 Mature grotworm drops Grimy snapdragon with rarity Uncommon in quantity 90-110 (noted)Grimy snapdragon (m)P2P icon.png90–110 (noted)Uncommon132,480-161,9200
Super restore (4).png: RS3 Mature grotworm drops Super restore (4) with rarity Uncommon in quantity 45-55 (noted)Super restore (4) (m)P2P icon.png45–55 (noted)Uncommon99,360-121,4408,100-9,900
Prayer potion (4).png: RS3 Mature grotworm drops Prayer potion (4) with rarity Uncommon in quantity 45-55 (noted)Prayer potion (4)F2P icon.png45–55 (noted)Uncommon213,615-261,0855,130-6,270
Lantadyme seed.png: RS3 Mature grotworm drops Lantadyme seed with rarity Uncommon in quantity 14-16Lantadyme seed (m)P2P icon.png14–16Uncommon7,196-8,224532-608
Dwarf weed seed.png: RS3 Mature grotworm drops Dwarf weed seed with rarity Uncommon in quantity 14-16Dwarf weed seed (m)P2P icon.png14–16Uncommon52,444-59,936532-608
Magic seed.png: RS3 Mature grotworm drops Magic seed with rarity Uncommon in quantity 4Magic seed (m)P2P icon.png4Uncommon125,6921,012
Palm tree seed.png: RS3 Mature grotworm drops Palm tree seed with rarity Rare in quantity 10Palm tree seed (m)P2P icon.png10Rare270,1501,520
Flax.png: RS3 Mature grotworm drops Flax with rarity Common in quantity 450-550 (noted)FlaxF2P icon.png450–550 (noted)Common56,250-68,7501,350-1,650
Molten glass.png: RS3 Mature grotworm drops Molten glass with rarity Common in quantity 45-55 (noted)Molten glass (m)P2P icon.png45–55 (noted)Common31,005-37,89545-55
Soft clay.png: RS3 Mature grotworm drops Soft clay with rarity Uncommon in quantity 450-550 (noted)Soft clayF2P icon.png450–550 (noted)Uncommon333,900-408,100450-550
Yew logs.png: RS3 Mature grotworm drops Yew logs with rarity Uncommon in quantity 68-82 (noted)Yew logsF2P icon.png68–82 (noted)Uncommon14,756-17,7946,528-7,872
Yew logs.png: RS3 Mature grotworm drops Yew logs with rarity Rare in quantity 675-825 (noted)Yew logsF2P icon.png675–825 (noted)Rare146,475-179,02564,800-79,200
Teak plank.png: RS3 Mature grotworm drops Teak plank with rarity Uncommon in quantity 45-55 (noted)Teak plank (m)P2P icon.png45–55 (noted)Uncommon31,320-38,28013,500-16,500
Mahogany plank.png: RS3 Mature grotworm drops Mahogany plank with rarity Rare in quantity 270-330 (noted)Mahogany plank (m)P2P icon.png270–330 (noted)Rare598,320-731,280243,000-297,000
Vecna skull.png: RS3 Mature grotworm drops Vecna skull with rarity Rare in quantity 1Vecna skull (m)P2P icon.png1Rare[d 1]185,4976,000
Blurberry Special.png: RS3 Mature grotworm drops Blurberry Special with rarity Very rare in quantity 1Blurberry Special (m)P2P icon.png1Very rare[d 2]11,71818
Cheese+tom batta.png: RS3 Mature grotworm drops Cheese+tom batta with rarity Very rare in quantity 1Cheese+tom batta (m)P2P icon.png1Very rare[d 3]4361
Hazelmere's signet ring.png: RS3 Mature grotworm drops Hazelmere's signet ring with rarity Very rare in quantity 1Hazelmere's signet ring (m)P2P icon.png1Very rare[d 4]1,535,207,358300,000
Brawling gloves (Melee).png: RS3 Mature grotworm drops Brawling gloves (Melee) with rarity Very rare in quantity 1Brawling gloves (Melee) (m)P2P icon.png1Very rareNot soldNot alchemisable
Brawling gloves (Magic).png: RS3 Mature grotworm drops Brawling gloves (Magic) with rarity Very rare in quantity 1Brawling gloves (Magic) (m)P2P icon.png1Very rareNot soldNot alchemisable
Brawling gloves (Ranged).png: RS3 Mature grotworm drops Brawling gloves (Ranged) with rarity Very rare in quantity 1Brawling gloves (Ranged) (m)P2P icon.png1Very rareNot soldNot alchemisable
Brawling gloves (Agility).png: RS3 Mature grotworm drops Brawling gloves (Agility) with rarity Very rare in quantity 1Brawling gloves (Agility) (m)P2P icon.png1Very rareNot soldNot alchemisable
Brawling gloves (Cooking).png: RS3 Mature grotworm drops Brawling gloves (Cooking) with rarity Very rare in quantity 1Brawling gloves (Cooking) (m)P2P icon.png1Very rareNot soldNot alchemisable
Brawling gloves (FM).png: RS3 Mature grotworm drops Brawling gloves (FM) with rarity Very rare in quantity 1Brawling gloves (FM) (m)P2P icon.png1Very rareNot soldNot alchemisable
Brawling gloves (Fishing).png: RS3 Mature grotworm drops Brawling gloves (Fishing) with rarity Very rare in quantity 1Brawling gloves (Fishing) (m)P2P icon.png1Very rareNot soldNot alchemisable
Brawling gloves (Hunter).png: RS3 Mature grotworm drops Brawling gloves (Hunter) with rarity Very rare in quantity 1Brawling gloves (Hunter) (m)P2P icon.png1Very rareNot soldNot alchemisable
Brawling gloves (Mining).png: RS3 Mature grotworm drops Brawling gloves (Mining) with rarity Very rare in quantity 1Brawling gloves (Mining) (m)P2P icon.png1Very rareNot soldNot alchemisable
Brawling gloves (Prayer).png: RS3 Mature grotworm drops Brawling gloves (Prayer) with rarity Very rare in quantity 1Brawling gloves (Prayer) (m)P2P icon.png1Very rareNot soldNot alchemisable
Brawling gloves (Smithing).png: RS3 Mature grotworm drops Brawling gloves (Smithing) with rarity Very rare in quantity 1Brawling gloves (Smithing) (m)P2P icon.png1Very rareNot soldNot alchemisable
Brawling gloves (Thieving).png: RS3 Mature grotworm drops Brawling gloves (Thieving) with rarity Very rare in quantity 1Brawling gloves (Thieving) (m)P2P icon.png1Very rareNot soldNot alchemisable
Brawling gloves (WC).png: RS3 Mature grotworm drops Brawling gloves (WC) with rarity Very rare in quantity 1Brawling gloves (WC) (m)P2P icon.png1Very rareNot soldNot alchemisable
Crystal triskelion fragment 1.png: RS3 Mature grotworm drops Crystal triskelion fragment 1 with rarity Very rare in quantity 1Crystal triskelion fragment 1 (m)P2P icon.png1Very rareNot soldNot alchemisable
Crystal triskelion fragment 2.png: RS3 Mature grotworm drops Crystal triskelion fragment 2 with rarity Very rare in quantity 1Crystal triskelion fragment 2 (m)P2P icon.png1Very rareNot soldNot alchemisable
Crystal triskelion fragment 3.png: RS3 Mature grotworm drops Crystal triskelion fragment 3 with rarity Very rare in quantity 1Crystal triskelion fragment 3 (m)P2P icon.png1Very rareNot soldNot alchemisable
  1. ^ Jagex. Mod Timbo's Twitter account. 19 January 2018. (Archived from the original on 22 January 2019.) Mod Timbo: "1/1280 if you hit the RDT, requires T4 luck to be worn in order to get a hold of it. Of course there are tons of different ways to access the RDT so it changes massively depending on what you're fighting, what you're wearing etc."
  2. ^ Indicates a failed 1/10 roll for Hazelmere's signet ring.
  3. ^ Indicates a roll for Hazelmere's signet ring without tier 4 luck.
  4. ^ Requires tier 4 luck. Rarer than the vecna skull.

Universal drops[edit | edit source]

Universal drops are dropped by nearly every monster outside of Daemonheim.
These items are dropped alongside main drops.

Achievement[edit | edit source]

Update history[edit | edit source]

The update history project is a work-in-progress – not all updates to this topic may be covered below. See here for how to help out!
  • patch 19 August 2019 (Update):
    • Grotworms are able to damage the player once again.

Trivia[edit | edit source]

  • When these creatures were first released, they did not drop items from the rare drop table, but did after the Queen Black Dragon update.
  • The word 'grotworm' means caveworm in Dutch.
  • Their examine text hints towards the possibility of the existence of a stronger grotworm based creature, although likely not an actual worm as "metamorphosis" implies, but none were released with them.
  • On 17 June 2013, these monsters received a massive power increase. Their life points more than tripled, their accuracy was increased greatly, and their damage output was made substantially higher. This considerably decreased the amount of botting and people in general coming to the grotworms for money. They were level 120 with 3000 life points before this update.
  • On the same 17 June 2013 update, the slayer experience rewarded increased from 73 to 360.5, to compensate for their increased strength.
  • Due to excessive botting, an update on 7 August 2012 removed several rune armour drops from the drop table of mature grotworms, replacing them with their adamant counterparts, making it less effective to earn money. The same update also removed royal bolts and super restore potions from their drop tables.