Oh God Why ~ AKA "DM: By the way the final boss of the campaign is Atropus"

[Kerrus]

There's at least two things wrong with that...

1. In space, no one can hear you rock.
2. Atropus is immune to mind affecting.

We're aware he's immune to mind affecting, but with a sufficiently powerful caster level, a dread witch can cast a [fear] descriptor version of Mindrape that burns through his immunities.

[muktidata]

Honestly, I wouldn't stress about it much.  The odds of this game lasting another 20 or so levels seems ... umm, doubtful from this thread.