Ahrim the Blighted's equipment is obtainable from the Barrows minigame. A full set consists of Ahrim's robetop, robeskirt, hood, and staff. The set requires 70 Magic and 70 Defence to wear, and 70 Attack to use the staff. Ahrim's robes give Melee Defence bonuses that Magic robes normally don't have, which makes it somewhat popular for PvP situations. The staff, on the other hand, is not commonly used, and the set effect is generally not seen as particularly useful; however, the staff is able to autocast Ancient Magicks when a full set is equipped alongside an amulet of the damned (otherwise it provides spells from the standard spellbook). Ahrim's (along with other Barrows equipment) degrades over a period of 15 hours, but only in combat.
Set effect
Blighted Aura: Magic attacks have a 25% chance of lowering the enemy's Strength by five levels repeatedly. The set effect does not activate if a spell splashes.