Thread:Gorzill/@comment-4001163-20141214171944/@comment-4001163-20150609044407

Well, Lavatufts cam survive underwater for decent periods of time considering the emmense energy and heat that their cores produce. However too much exposure to heavy amounts of moisture can disable or even kill a Lavatuft.

Though, as mentioned in their creature page, a select few Lavatufts have the ability to survive underwater without any major problems. Their ability to use fire as a weapon would be useless however.