Combust

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Combust is a basic Magic ability and one of three bleed abilities for the Magic skill, the others being Lesser Combust (which Combust replaces at level 20 Magic) and Corruption Blast. When activated the target takes damage over 6 seconds, dealing 5 hits that total to 100-188% of active spell damage. If the opponent moves while under the effect of combust the damage taken doubles. This persists unless the opponent moves back to their original spot when they got hit, in which damage stops being doubled. The percentage is decided on the first hit, and each subsequent hit will deal the same damage as the first. Notably, the 100% is a minimum damage and it functions well as auxiliary damage, especially when combined with another ability such as Asphyxiate.

Ranged has a functionally identical bleed to Combust in Fragmentation Shot. Melee also has a bleed akin to Combust: Dismember, a basic ability with the same base damage potential but without the double damage effect.

Unlike normal abilities, damage over time effects are not affected by:
Damage boosting prayers and ancient curses (aside from their accuracy bonus)
Damage boosting abilities: Berserk, Death's Swiftness, and Sunshine (with the exception of Metamorphosis)
Zaros Godsword's special attack
Berserker's Fury relic power
Most invention perks affecting variable damage, including Genocidal, Precise, Equilibrium, and Ruthless
Some items from the slayer (effect) groups, including: tuned Bane equipment, Salve amulet (e), Demon slayer equipment, Darklight
Critical hits
Slayer helmet and its variants
Damage over time effects are only affected by some modifiers, including:
Damage bonus from equipment
Visible combat skill boosts, from potions or other sources
Vulnerability or its lesser form, Curse
Berserker, Reckless, and Maniacal auras - however, while inside the effects of Berserk, Death's Swiftness, or Sunshine, the aura's invisible boost is negated
Mahjarrat and Dark magic auras - regardless of being inside the effects of Berserk, Death's Swiftness, or Sunshine
Among the Dragon slayer, Demon slayer, and Undead slayer effect groups, only the slayer invention perks and slayer abilities affect bleeds
Scrimshaws

This may make it less desirable in some situations, but due to its higher-than-normal minimum hit, it is still one of the higher-damage abilities on average. However, Combust also has an abnormally high chance of hitting its minimum damage, which makes its average ability damage 120.6% (compared to Dragon Breath, which has an average ability damage of 112.8% and is affected by the above boosts).

The Lunging perk increases the base damage of this ability by 20% per rank, but moving the target only does 1.5x damage instead of 2x.

Tactics[edit | edit source]

  • Although not obvious, Combust could be combined with Asphyxiate to increase the chance of killing your opponent. However, this should only be done after they have moved, as Asphyxiate will keep them in place and prevent the double damage.

Counter-tactics[edit | edit source]

  • Due to its low damage nature, ignoring it is actually the best method as long as you do not move. Freedom is not recommended.

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 26 November 2018 (Update):
    • Bleeds no longer deal 1 damage on their first hit in PvP.
    • Frag Shot and Combust now share a cooldown.

Trivia[edit | edit source]

  • During the EoC beta, Combust dealt 200% damage.