Some questions: Can my cohort (and/or anyone else who wishes to) remain standing on top of Regideus during combat? If so, how will that work as far as casting/spellshaping and being targeted by attacks?
In your mob template rewrite* the mob anatomy special quality contains the line "A mob can be flanked, tripped, bull rushed by anyone." Is this accurate or is it supposed to read "can't be..."?
I'm also confused by this passage:
Saves: A mob uses the same saving throws as the base creature, but failed saves never result in anything worst than negative levels as it loses members. Effects that don't instantly disable a creature (like blindness or curse) have no effect whatsoever on the mob.
So, even an effect that encompasses the whole of the mob's area cannot inflict status conditions on it? Why not? If the whole mob is subject to an effect that blinds, why shouldn't the mob be blinded?
And what about effects that do "instantly disable" and have the area to encompass the whole mob? An area daze, for example?
*Just in case anyone hasn't had a look at it, the square blocks are mobs made using these rules
and the one in the larger ruin set is probably a led mob.