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Release date 20 November 2012 (Update)
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Skill Defence
Level 55
Type Threshold
Adrenaline −15%
Equipment Any
Cooldown 30 seconds
Debilitate your target for up to 100% weapon damage, also reducing any damage they deal to you by 50% for 8.4 seconds. This duration increases if a shield is equipped by 0.6 seconds for every 10 shield levels.
Click animation for full size

Debilitate is a threshold Defence ability. When activated the target takes up to 100% weapon damage and any damage they deal to the user is reduced by 50% for 8.4 or more seconds, depending on if they're wielding a shield as well as the tier of the shield equipped. For every 10 shield levels, 0.6 seconds are added. This ability does not reduce most typeless damage, although there are exceptions such as Nomad's auto attacks, Helwyr's bleeds and Vorago's vitalis orb.

This practice is very powerful when used with a divine spirit shield, arcane spirit shield, or an elysian spirit shield as the damage reduction is calculated after debilitate takes place, effectively causing the player to reduce damage taken 65% while the attacker takes 50% rebounded damage. The damage reduced is not 80% because damage reduction in RuneScape is calculated multiplicatively, not additively. A 100% damage reduction or over is not possible by equipping multiple damage reducing gear and stacking multiple damage reducing abilities. Debilitate stacks with reflect, giving 75% damage reduction.

Tier Duration
No shield 7.8 seconds
1 7.8 seconds
10 9 seconds
20 9.6 seconds
30 10.2 seconds
40 10.8 seconds
50 11.4 seconds
60 12 seconds
70 12.6 seconds
80 13.2 seconds
90 13.8 seconds


  • For a time after the Evolution of Combat, this ability only worked with melee and ranged weapons. Mages attempting to use this ability would go up to melee distance and use this, and it would rarely hit because magic weapons have no accuracy with melee attacks. This glitch has been fixed.

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