Collector lvl 5 - The RuneScape Wiki

Collector lvl 5 is an item held in the pocket slot while playing Barbarian Assault. It shows a player's collector level by creating a yellow circle around them with the collector symbol and a gold star. It cannot be removed or interacted with in any way besides examining it. When a game of Barbarian Assault finishes, the icon is removed.

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There seems to be a bug with new TH promo, I didnt recieve assassin's contract : r/runescape