Claws of Guthix is a combat spell in the standard spellbook. Casting it requires a Magic level of 60 in addition to having either a guthix staff or a void knight mace equipped. Casting it uses 1 fire rune, 2 blood runes and 4 air runes each cast. The spell is unlocked by completing the Mage Arena activity; it has to be cast 100 times within the arena itself in order to be used anywhere else. Upon a successful hit, Claws of Guthix lowers the target's Defence by 5%. This decrease does not stack nor will it reapply itself until the opponent returns to their base Defence level.
Note that since Claws of Guthix requires a Guthix staff or a Void knight mace, rune-providing staves cannot be used. However, a tome of fire can be worn to provide infinite fire runes.
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