Is there anything you can do with the huge soul gems in the soul cairn?

They kill you and svck you souless.

Down a couple of soul husks before going near one to help with health

you know some of the gates in the souls cairn and some of the pillars with a blue orb in em, do i have to do something to them to open the gates?

Use a ranged weapon to hit them. Bow, spell. There are 2 for each gate.