When a player enters the Ring of Law in the Depths, an arena event will occur where players have to face three waves of non-elite enemies and finally an elite mini-boss. Ok'thor is one of six possible mini-bosses that could appear. The other ones are Anub'shiah, Eviscerator, Grizzle, Hedrum the Creeper, and Gorosh the Dervish.
- Arcane Bolt - Hurls a magical bolt at an enemy, inflicting 184 to 248 Arcane damage.
- Arcane Explosion - Sends out a blast wave of magic, inflicting 275 to 300 Arcane damage to nearby enemies.
- Polymorph - Transforms an enemy into a sheep, forcing it to wander around for up to 8 sec. While wandering, the sheep cannot attack or cast spells. Any damage will transform the target back into its normal form. Only one target can be polymorphed at a time.
- Slow - Increases the time between nearby enemies' attacks and casting time by 54% and slows their movement by 60% for 10 sec.