I have 94 lvl Trapsin w/infinity and enigma and she can run efficiently any area in the game, including p8 Chaos. The only exception is Council: I noticed that the merc dies too often and there's a council member with fire/light immunity which needs a merc. Even when the merc survives the fight seems way too slow. Any tips how to handle them?

Kicks do fine

Merc dies from hydras.
Steel shade solves this (I like Cham) but may leave you lacking in other farming areas