Hey guys,
just had struggle killing Posiaclawn as a part of ambush as a melee character playing solo, though the other 2 were no problem at all.
my crits decreased to ~10% of the usual damage i deal and regular hits went to a permanent 0.
since its ability is still unknown, i wanted to give a shot at either decreasing player damage over time or increasing its own amor (stats-wise comparable to increased %Parry / %Critical Flux / %Physical Damage Reduction)
my charm did regular damage (as usual on ambush)
let me know if you found something similar.