Scalding Water
From WoWWiki
Scalding Water is an effect/debuff that occurs in Serpentshrine Cavern after defeating the 6 platform packs surrounding The Lurker Below. As long as these packs are cleared, the water will be boiling, killing all of the Coilfang Frenzy in the water. If the platform packs respawn, the water stops boiling and the Coilfang Frenzy return.
Entering the water causes 500 physical damage each time. This includes jumping out of the water and falling back in. While in the water, players will have a debuff that deals 500 Fire damage every 3 seconds.
Defeating The Lurker Below removes the Scalding Water.
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