Zombie head
Disruptor Rod was removed from RuneScape after an update, but still exists in-game for those who had obtained it.
Disruptor Rod detail

The disruptor rod is an item received from the Bandosian or Armadylean quartermaster during the Bird and the Beast world event. When used on another player that is working on a site or attacking a caravan, it will temporarily stun them. Each rod has 10 charges and are fully recharged daily. The rod can also be charged or decharged as part of a convoy random event. When this happens, the following message is displayed:
A surge of energy has recharged disruptor rods held by nearby players.

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