Claws of Guthix is a combat spell in the standard spellbook, requiring 60 Magic and the completion of Mage Arena I to cast. In addition, players must also be wielding a Guthix staff, void knight mace, or staff of balance.
Claws of Guthix has a maximum hit of 20. Like the other god spells, the maximum hit is temporarily increased to 30 while the Charge spell is active and the respective god cape is worn. 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.
The void knight mace and the staff of balance are capable of autocasting Claws of Guthix.
Note that since Claws of Guthix requires a Guthix staff, void knight mace or a staff of balance, rune-providing staves cannot be used. However, a tome of fire can be worn to provide infinite fire runes. This does not grant the 50% damage boost from the tome, therefore charges from the tome will not be consumed.