Frostbite

Frostbite  is a status condition similar to poison that is given to players randomly in the "Greater Deep" section of the God Wars Dungeon; however, it can also be inflicted by the Zamorak godsword|Zamorak godsword's Godsword enchant special attack. Jagex has stated that they will release more Frostbite-inflicting things in the future.

It works similarly to Poison, except that it is much more deadly, as it deals damages more often. If the player is in the God Wars Dungeon, the damage that the Frostbite deals will decrease much more slowly, and will only return to its normal decreasing speed if the player dies or leaves the Greater Deep.