Pest Control - The RuneScape Wiki

Pest Control is a co-operative members-only combat-based minigame. In it, players must defend an NPC known as the Void Knight from an onslaught of monsters, while at the same time destroying the portals from which the monsters spawn. It is advisable to have some players stay at the Void Knight and some at each portal.

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Void Knight (Pest Control) - OSRS Wiki

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Update:Pest Control & Open Weekend

Pest Control Guide How to Get Void Armor [OSRS]