Prevent monster heal, can merc apply

[Baajikiil]

I seem to recall (correct me if I'm wrong) hearing that you have to do damage. So if you punch a physical immune monster and have no elemental damage, it won't be applied.

I believe you are thinking of open wounds; open wounds will not trigger if there is no damage dealt. It *will* work on phys immunes if you can damage them with elemental though.