|Release date||20 November 2012 (Update)|
|Debilitate your target for up to 100% weapon damage, also reducing any damage they deal to you by 50% for 7.8 seconds. This duration increases if a shield is equipped by 0.6 seconds for every 10 shield levels.|
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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 7.8 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, and the Bulwark perk can further increase the duration. This ability does not reduce most typeless damage, although there are exceptions such as Nomad's auto attacks, Helwyr's bleeds, most of Telos's special attacks, 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.
If defensive abilities are reset by any means, debilitate will be affected. Although the enemy will retain the debilitate debuff for its full duration, the player will not take reduced damage as his invisible buff has been removed.
|No shield||7.8 seconds|
Debilitate functions by both "debuffing" the target and by invisibly "buffing" the user for the same amount of time. The debuff is only a timer, but the buff indicates a specific enemy. If a player takes damage from an enemy with the debilitate debuff and the player's buff indicates that same enemy, then the player takes reduced damage. Therefore, interactions in group-based content are as follows:
- If two players both debilitate a target, then both players will take reduced damage from that target until their respective buff timer runs out.
- If a player debilitates two different targets in quick succession - only possible with the passive effect of raids armour - they will only take reduced damage from the target that was last debilitated.
- 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.