Corrupt Zuriel's robe top is a part of the Corrupt Zuriel's EquipmentPvP armour set, obtained from killing Revenants in the Forinthry Dungeon or as a very rare drop from the Chaos Elemental. The robe top requires 40 Defence, but has level 65 bonuses. It lasts only for 15 minutes of wearing. After the time is up, the robe top will vanish.
Once you wear this item for longer than around 30 seconds, it will have the word (deg) added to its name and it becomes untradeable. Using this item in combat adds the (deg) to its name instantly, also rendering it untradeable.