Demon Slayer is an Invention perk that increases damage dealt to demons by 7%. It can be created in weapon and armour gizmos.
Demon Slayer applies against the same demons as darklight. The perk has an effect on K'ril Tsutsaroth in normal mode. However, it does not work against K'ril Tsutsaroth in hard mode, or against the Twin Furies.
The Demon Slayer perk is an excellent option when augmenting equipment for Slayer training.
The damage increase from the Demon Slayer perk affects damage over time abilities that have a bleed effect i.e. Dismember, Combust, etc.
The following creatures will take increased damage from Demon Slayer:
Gizmo layout |
Possible perks |
| 51.00% chance for Biting 4 and Demon Slayer at level 120, 56.75% with 
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| 49.61% or 1/2.01 at level 120.
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| Use this combination in weapon gizmos only. Benefit is that Bandos components tend to be significantly cheaper than Undead components. Order is important to not get Dragon Bait as a perk.
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| Order is important to get a good chance of perk combination, only use in weapon gizmos
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| Use this combination in weapon gizmos only.
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| A second Third-age component will guarantee the combination of perks.
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| Use this combination in weapon gizmos only.
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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 12 February 2018 (Update):
- Icons were added to the combat target interface for NPCs indicating whether they are affected by the Demon, Dragon or Undead Slayer perks (if the attacker has the relevant perk equipped).
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Abilities |
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Damage/Accuracy modifying |
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Damage reduction |
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Adrenaline |
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Prayer |
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Additional items |
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Experience |
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Skilling |
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Miscellaneous |
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Ancient |
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