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Deadly Lava

Lava will kill you after 2 seconds unless you have lava immunity.

The duration can be configured via a patch file by changing the deathAfter value in /stats/effects/c5dl/c5dl_deadlylava/c5dl_deadlylava.statuseffect
This effect is decoupled from the melting status effect so if you want to add it to your own liquid simply add it via a patch file.