The Inquisitor's plateskirt is a drop from The Nightmare, requiring 70 Strength and 30 Defence to equip, and is part of the Inquisitor's armour set.

When equipped, the plateskirt boosts damage and accuracy by 0.5% when using the crush attack style. If all three pieces of the armour are equipped, the boost is increased to 2.5% (7.5% if using the inquisitor's mace). In addition, it counts as a Zamorakian item in God Wars Dungeon.

Once belonging to "The Inquisitor", a former Saradominist Justiciar and one of the founders of Slepe, the Inquisitor's armour had remained sealed in the Sisterhood Sanctuary deep beneath Slepe until The Nightmare's arrival unearthed it.

This item can be stored in the armour case of a costume room, as part of the Inquisitor's armour. Ultimate Ironmen will be unable to retrieve individual pieces until the full set is stored.