Re: all of the suggestions that Redcloak should have used Blasphemy / etc. instead of Implosion, keep in mind that he didn't plan for this meeting. He's limited to the spells that he had prepared for a dungeon crawl.
Also the creatures he was expecting to find are higher power-level than him, and probably non-good. Like Neutral animals and what-not. So Blasphemy's power would reduced even further.
"Besides, you know the saying: Kill one, and you are a murderer. Kill millions, and you are a conqueror. Kill them all, and you are a god." -- Fishman