An NPC was an idea if I ever to a home brew game again. :)
I used Jotund Troll before...can't remember if he swallowed any pcs?
That's a pretty funny visual of the rogue. I think I would make the pcs hold their breath when swallowed.
As for Feast of Blood. I think it's more cool thematically than a great ability. It should allow you to make an intimidate check against the creature and its allies with a massive bonus vs the creature.
So should Bloody Fist.
Speaking of which.
***Bloody Fist (Ex)
Prerequisite(s): Barbarian 12
Benefit(s): While raging, the barbarian may attempt to punch through an opponent’s flesh and rip out one of its vital organs. In order to do so, the barbarian must confirm a critical hit against an opponent with a natural attack or unarmed strike. The barbarian deals damage as normal for a critical hit and the opponent must succeed at a Fortitude save (DC = 10 + 1/2 the barbarian’s class level + the barbarian’s Strength modifier) or take 1d4 points of Constitution damage as one of its vital organs is ripped free from its body.
This power can only be used once per rage.***
"as one of its vital organs is ripped free from its body."
That organ doesn't seem very vital. ;)