Verona And Aleera
These two must be taken care of before you can battle the boss. This can result in heavy damage unless you are careful and use the shotgun from a distance. There are three attacks to look out for. The first is bolts of electricity that fire out from the pair. Should you get caught in one of these, run behind one of the pillars to break the spell as quickly as you can. The second main attack is electric bolts from above. You can see these about to form; purple 'blobs' appear on the floor. Make sure you aren't under one when it happens!
The last attack is when the pair fire a shockwave at you - when this happens, roll backwards to steer clear of trouble. Keep moving and firing with the shotgun, and they should both be disposed off quite quickly, allowing you to fight (DEMON MARISHKA)

Demon Marishka
When you finally get to battle with this boss, she proves quite a tough cookie! The best approach is to wait until she is at ground level, then to roll towards her quickly. Enchant your hand weapon, then attack her three or four times. That done, roll UNDER her, rather than away from her. She will attack the area you have just vacated and you can repeat the process. Be careful of her electricity attacks, as they can cause you damage - try to roll out of the way as quickly as you can!

if u use an alt pistol on the 2 sisters out side and kill them the barrier opens then u use the shot gun and press aim and a to roll and keep shooting with the shot gun when u get up