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In the last area the boss room is accessible via a portal hidden in the stone structure directly to the right when entering the area. You need to break the wall with attacks, then you can enter when you killed the reapers and get to the boss.
Might try this: http://coderbag.com/programming-c/disable-cpu-core-parking-utility
From what you're saying it seems like your CPU thinks that it doesn't need to utilize all of its cores when it indeed does, which is why your game performance jumps when you pull up something more demanding. This is a feature of windows itself and is called CPU parking, so the 'parked' cores only get activated by windows when it thinks it's necessary, unparking them with the program only changes 2 registry entries telling windows not to park any cores.
Additionally, putting your PCs energy saving plan (or whatever the option is called in english) to high performance might also help.
I could have hung out with Muir for an hour. He couldn't touch me. Every time hit said to hit his back he was facing inward, not outward. Got super boring. All you Vindictus gods must really impress yourselves.
Uhh....I know this might sound stupid and I don't mean to be disrespectful but you make it sound like you only ever tried to push him when he's doing his exhausted animation. You don't have to wait for that, you can just hit his back to push him forward any time when he's in his last phase.