Poison gas
Poison gas can be found killing the zombie variant of undead ones on Karamja. All players within a square of the gas will receive 2-3 damage per hit. To avoid this, players need to be at least two squares away from the gas.
As the gas does not inflict recurring poison, anti-poison potions are not required.
Historical
Poison gas was also a former random event that occurred while Thieving from chests. Occasionally the chest would become stuck and gas would come out and damage nearby players. Despite the fact it had a green hitsplat, however, the gas did not inflict recurring poison.
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