Patch Available - KMST 1.2.406

By "other classes", you mean "Demon Slayers", correct?
I must be missing something if Mercedes can tank.

As for Blast, I don't think it's bad by any length.
Our real problem, damage-wise, is that we're overly reliant on Charge advantage in a game that doesn't emphasize it.

Nope.
Mercedes has ridiculous amounts of damage reduction and evade skills, totaling up to like 60% evasion and 50% damage reduction or some ridiculous as f'uck number. Taking 0 damage > taking 800 damage.

Blast is awful in a sense that it's only marginally better (in perfect 1 vs. 1 scenarios) than Advanced Charge Blow (which hits 7 mobs and stuns) and it has the shortest range of any 4th job skill in the game.

Stance in 2nd job would free up 3rd and 4th job for better skills.