Yk'Lagor the Thunderous

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For the music track, see Yk'Lagor the Thunderous (music track).
Yk'Lagor the Thunderous icon.png

Yk'Lagor the Thunderous is the final Dungeoneering boss monster encountered on the occult floors. He is found on floors 45 to 47 of Daemonheim. A Dungeoneering level of 89 is required to fight him. He is a high-ranking Kal'Gerion demon and one of Kal'Ger the Warmonger's generals.

When Bilrach used portal magic to contact the Kal'Gerions, Yk'Lagor was one of the demons who broke through the portal and fought Bilrach's forces. During the battle, he toppled and taunted a behemoth. Although the Kal'Gerions were welcomed by Bilrach after having proven his superiority to them, Yk'Lagor fell into disfavour after demanding Bilrach to bring him more troops from the Infernal realms after he himself had vastly thinned out his own troops by making them kill each other. Bilrach did not look kindly upon it and imprisoned Yk'Lagor and had his power bleed from him for almost four centuries. It is not known if this was part of his punishment, but a group of mysterious mages started to siphon the power from the subdued demon to empower themselves, however after just a few mages were killed, Yk'Lagor regained enough strength to break free from his magical bond, killing all the mages with one vicious blow before turning on those who set him free.

The fight[edit | edit source]

Unlike other bosses who are immediately ready to fight when the player enters the room, Yk'Lagor must first be freed before he can be fought. In his room, there are eight mysterious mages that are subduing Yk'Lagor with a magical barrier. After attacking four of the mages, the demon will roar "My turn!" and break free from the barrier, causing the entire dungeon to shake and the ensuing shockwave will kill the remaining mages; the shockwave does not harm the player(s) at all. Immediately afterwards, he begins the battle with his magical drag attack.

Yk'Lagor's standard melee attack involves slashing the player if the player is standing in melee-range. The demon will attack with a fire based magical attack if no players are next to him which can drain prayer points and ignores protection prayers.

Yk'Lagor has two powerful special attacks which he alternates between. As mentioned above, he uses a magical drag attack when he shouts "Come closer" and pulls the players across the room, healing 15% of his health per player dragged in. This attack will stun the player, drain their prayer points and disable any prayers they had active. The attack can be avoided by hiding behind any of the four pillars in the boss room. Use Freedom if caught.

His second special attack is an earthquake that is indicated when he shouts "This is..." before jumping into the air, followed with a scream of "TRUE POWER" when he lands and cracks the floor. This attack can deal over 12,000 typeless damage to all players who are not behind the pillars.

Gatestone teleport, Group Gatestone Teleport, and Gatestone 2 teleport can only be used if standing behind one of the pillars. Attempting to teleport from anywhere else in the room gives the message "You can't teleport here". Thus, gatestones cannot be used to evade his special attacks.

Strategy[edit | edit source]

Yk'Lagor's special attacks can be avoided by running behind a pillar as soon as the text appears above his head or you hear his voice. To hide more easily from the boss's special attacks, it is recommended to use either ranged or magic.

Apart from his special attacks, Yk'Lagor will behave in a pattern depending on the players' positions. As long as one person is close to him, Yk'Lagor will use his melee attack, which is very fast and damaging.

As long as one person stands away from him, he will use his magic attack, which hits everyone in the room. You will still get hit even if you stand behind a pillar, but only if he can target a player in his range, meaning if one player is not hiding behind a pillar, all players will get hit.


Yk'Lagor trapped by a magical shield.
Yk'Lagor killing the mages.
Yk'Lagor's magical drag.
Yk'Lagor punching the ground.
Yk'Lagor's magical attack.

Drops[edit | edit source]

Item Members Quantity Rarity GE price High Alch
Novite battleaxe.png: RS3 Yk'Lagor the Thunderous drops Novite battleaxe with rarity Random in quantity 1Novite battleaxeF2P icon.png1RandomNot soldNot alchemisable
Off-hand novite battleaxe.png: RS3 Yk'Lagor the Thunderous drops Off-hand novite battleaxe with rarity Random in quantity 1Off-hand novite battleaxeF2P icon.png1RandomNot soldNot alchemisable
Bathus battleaxe.png: RS3 Yk'Lagor the Thunderous drops Bathus battleaxe with rarity Random in quantity 1Bathus battleaxeF2P icon.png1RandomNot soldNot alchemisable
Off-hand bathus battleaxe.png: RS3 Yk'Lagor the Thunderous drops Off-hand bathus battleaxe with rarity Random in quantity 1Off-hand bathus battleaxeF2P icon.png1RandomNot soldNot alchemisable
Marmaros battleaxe.png: RS3 Yk'Lagor the Thunderous drops Marmaros battleaxe with rarity Random in quantity 1Marmaros battleaxeF2P icon.png1RandomNot soldNot alchemisable
Off-hand marmaros battleaxe.png: RS3 Yk'Lagor the Thunderous drops Off-hand marmaros battleaxe with rarity Random in quantity 1Off-hand marmaros battleaxeF2P icon.png1RandomNot soldNot alchemisable
Kratonite battleaxe.png: RS3 Yk'Lagor the Thunderous drops Kratonite battleaxe with rarity Random in quantity 1Kratonite battleaxeF2P icon.png1RandomNot soldNot alchemisable
Off-hand kratonite battleaxe.png: RS3 Yk'Lagor the Thunderous drops Off-hand kratonite battleaxe with rarity Random in quantity 1Off-hand kratonite battleaxeF2P icon.png1RandomNot soldNot alchemisable
Fractite battleaxe.png: RS3 Yk'Lagor the Thunderous drops Fractite battleaxe with rarity Random in quantity 1Fractite battleaxeF2P icon.png1RandomNot soldNot alchemisable
Off-hand fractite battleaxe.png: RS3 Yk'Lagor the Thunderous drops Off-hand fractite battleaxe with rarity Random in quantity 1Off-hand fractite battleaxeF2P icon.png1RandomNot soldNot alchemisable
Zephyrium battleaxe.png: RS3 Yk'Lagor the Thunderous drops Zephyrium battleaxe with rarity Random in quantity 1Zephyrium battleaxeF2P icon.png1RandomNot soldNot alchemisable
Off-hand zephyrium battleaxe.png: RS3 Yk'Lagor the Thunderous drops Off-hand zephyrium battleaxe with rarity Random in quantity 1Off-hand zephyrium battleaxeF2P icon.png1RandomNot soldNot alchemisable
Argonite battleaxe.png: RS3 Yk'Lagor the Thunderous drops Argonite battleaxe with rarity Random in quantity 1Argonite battleaxeF2P icon.png1RandomNot soldNot alchemisable
Off-hand argonite battleaxe.png: RS3 Yk'Lagor the Thunderous drops Off-hand argonite battleaxe with rarity Random in quantity 1Off-hand argonite battleaxeF2P icon.png1RandomNot soldNot alchemisable
Katagon battleaxe.png: RS3 Yk'Lagor the Thunderous drops Katagon battleaxe with rarity Random in quantity 1Katagon battleaxe (m)P2P icon.png1RandomNot soldNot alchemisable
Off-hand katagon battleaxe.png: RS3 Yk'Lagor the Thunderous drops Off-hand katagon battleaxe with rarity Random in quantity 1Off-hand katagon battleaxe (m)P2P icon.png1RandomNot soldNot alchemisable
Gorgonite battleaxe.png: RS3 Yk'Lagor the Thunderous drops Gorgonite battleaxe with rarity Random in quantity 1Gorgonite battleaxe (m)P2P icon.png1RandomNot soldNot alchemisable
Off-hand gorgonite battleaxe.png: RS3 Yk'Lagor the Thunderous drops Off-hand gorgonite battleaxe with rarity Random in quantity 1Off-hand gorgonite battleaxe (m)P2P icon.png1RandomNot soldNot alchemisable
Promethium battleaxe.png: RS3 Yk'Lagor the Thunderous drops Promethium battleaxe with rarity Random in quantity 1Promethium battleaxe (m)P2P icon.png1RandomNot soldNot alchemisable
Off-hand promethium battleaxe.png: RS3 Yk'Lagor the Thunderous drops Off-hand promethium battleaxe with rarity Random in quantity 1Off-hand promethium battleaxe (m)P2P icon.png1RandomNot soldNot alchemisable
Primal battleaxe.png: RS3 Yk'Lagor the Thunderous drops Primal battleaxe with rarity Random in quantity 1Primal battleaxe (m)P2P icon.png1RandomNot soldNot alchemisable
Off-hand primal battleaxe.png: RS3 Yk'Lagor the Thunderous drops Off-hand primal battleaxe with rarity Random in quantity 1Off-hand primal battleaxe (m)P2P icon.png1RandomNot soldNot alchemisable
Kal'gerion  notes (part 1).png: RS3 Yk'Lagor the Thunderous drops Kal'gerion notes (part 4) with rarity Common in quantity 1Kal'gerion notes (part 4)F2P icon.png1Common[d 1]Not soldNot alchemisable
Mysterious chronicle.png: RS3 Yk'Lagor the Thunderous drops Mysterious chronicle with rarity Common in quantity 1Mysterious chronicleF2P icon.png1CommonNot soldNot alchemisable
  1. ^ Only dropped on floor 45

Quotes[edit | edit source]

Yk'Lagor's initial concept art. He has since been graphically updated.
Audio options icon.png
RELEASE ME!
When bound
Audio options icon.png
My Turn!
When breaking free
Audio options icon.png
You dare steal my power?!
When killing the mages
Audio options icon.png
Come closer!
Before performing his magical drag
Audio options icon.png
This is... TRUE POWER!
When using his Earthquake special
Audio options icon.png
Another kill for the Thunderous!
After killing the player
Audio options icon.png
There is no escape!
If the player gets grabbed when trying to hide but is unsuccessful

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 25 August 2010 (Update):
    • Removed a couple of pillars in the Yk'Lagor the Thunderous boss room.

Trivia[edit | edit source]

Yk'Lagor breaking free.
  • One of the phrases the mages binding Yk'Lagor The Thunderous are chanting is "Heim crabs are awesome" backwards. (This was confirmed during the Q&A session at Runefest.)
  • With the addition of this boss, this is the first time voice acting has appeared in the game aside from the tutorial.
  • In Yk'Lagor's concept art, it is shown that his original title was "the Vociferous", which can be understood as a synonym for "the Thunderous" (a loud or noisy scream); he was also entitled as "Demon Prince".
  • Yk'Lagor introduced a trend in which his Magical Drag attack is used by many powerful monsters, not limited to Kal'Ger the Warmonger, a variation that Nextroll wizards, and Mother Mallum all use, and its sound effects are used in the Ancient ceremonial robes emote.
  • Yk'lagor used to have another special attack in which he created an area of explosions around him (similar to the ancient curse Wrath), but for some reason this was removed.
  • As shown in the video from Jagex's YouTube channel, there were 4 pillars on the northern and the southern part of the room. In the actual game, there are only 2 pillars on each side.
  • Currently there is a glitch where if a player dies at the same time as Yk'Lagor's magical drag special attack is used, the player may be dragged into the boss room from the start room.
  • Resonance used to work on his earthquake special attack.
  • Yk'Lagor is voiced by Mod Osborne.