Crucified

"Bitch, I will kill you!"

It said, and a poisonous cloud exploded out of its body; this bastard was poison master; though it fought like the fighter, now it had during the seer poison, it had once again become a poison master, an extremly dangerous poison master.

Seer poison is a very dangerous alchemical solution that could only be used by High Grandmaster and above. 

This poison did not distinguish between the friends and the enemy, it would kill all, and even its user wouldn't come out unscathed. It will damage its life essences, which might take decades or even centuries to recover, and some never recover.

This is why it is the last option of every poison master, and they will not use it unless they see only death ahead of them.