Hey guys, I'm embarrassed to say I'm utterly stuck on the level Cabal Co Offices. There doesn't seem to be any walkthrough around, so I have to ask for help! What is this, 1995? :P

Anyway, after generally blowing the offices up I found the key to Level B of the offices - there's a corridor which goes in a square with various higher-class offices, a janitor's closet, and some toilets. There are some windows I can jump down from to get a medkit, ward, and Life Seed, and a safe in one of the meeting rooms.

I've blown up everything, and can't seem to find anything that will let me progress. There's one of the really tough Behemoths left, but I can avoid him quite easily. Do I have to kill him, or is there something I'm missing?

EDIT: Okay, I got past that bit. A tiny, tiny panel was hidden in the floor of one of the meeting rooms.

Now I'm stuck on the final boss, The Ancient One. How the hell am I supposed to kill this thing? He fires some sort of nuke that I can't avoid, the blood around him is like sludge, and my weapons do very little damage. What do I do?

I defeated the Ancient One by running around on the ledge to the right and taking cover behind the small pillar with the Anger powerup on it (at least IIRC it's called Anger, the power up that multiplies your damage). Once I've been in cover, it was only a matter of grabbing the Anger between his attacks and then blasting him with everything I've got.