Q. about R'Lyeh Mind Blast

[shovah]

if on fire, as all other units, they will sit back and fire (well people with short range like javelins will try to get into range then fire iirc). Mind blast does damage but often not much, it does cause paralysis though. if set to attack they will only attack hand to hand, no firing. Best tactic is some/quite a few unarmoured illithids (better mind blast) coupled with a horde of lobo guards+slaves.
A question i have is does flaming arrows affect mind blast (i doubt it but would be cool)