I'm not completely sure, but it think that Lavasioth's Tail is now breakable in MHW (just breakable, not severable). However, at the moment i don't have real proofs about it, i'll try to link a proof when i can.

EDIT: Yep, is breakable, no rewards if you break it unfortunately, but it does't harden when lava turns solid. Also, is mentioned in-game that tail can be broken.

Drake 512 (talk) 13:26, March 10, 2018 (UTC)

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