The purple circle applies Temporal Chains to slow you down, the green circle applies Enfeeble to lower your damage while the red circle applies Vulnerability to increase the Physical Damage you take. While she only has a Physical Melee and projectile attack, the arena is covered in circles which each apply a curse. Try to stay close and pick up Malachai's Entrails after defeating her. She often casts delayed Lightning Spells around the arena, warps away and attacks you with a barrage of spells. Maligaro is the easiest fight, just stay out of his ground spells and corpse explosions.After defeating the Vaal Oversoul, you can either wait out the long animation until the exit opens, or log out and log back in to take the Waypoint to the City of Sarn. This is its fastest move and can be dangerous, but if you move sideways from the lasers you'll be fine.

If you're distant it shoots three lasers in succession that damage and shock you. Luckily it has no tracking, so you can simply just move to the other side of the boss. At close range it charges up a slam towards your position that kills you. The other moves depend on your distance to the Vaal Oversoul. This move can be dangerous if you stand still, so keep moving until it's over. It may also start an earthquake that makes rocks fall down on you. The boss can shoot icy projectiles in an arc that leave a ground effect to chill and damage you.

Aside from that, it has four additional moves which are mostly slow and easily avoided. This move can be repeated during the fight.

After its very long spawning animation, it always summons additional enemies followed by burrowing in the ground. Once you interact with the Dark Altar in the middle of the arena, the Vaal Oversoul fight begins.

Dead space 2 chapter 10 walkthrough