When I first go against this Raze guy, he keeps going into those things that summon the skeletons to heal himself... how do I shut them down for good, kill that guy or whatever makes me finish this part of the game?
One can only know how far he can go by going too far.
you need to push the levers next to the 2 healing chambers, then try to kill him while those are down...I don't know the exact cooldown but I'd say it's around 15 seconds....so if you can't kill him in 15 seconds, go back to the lever before that and push it again before he comes to heal
He don't heal all the time, only when you're about to kill him, and then, 15sec is the delay to the lever to come up again, you don't have to wait to pull it again, just keep doing this and he'll eventually die.