So i've just passed the work week in the underground and accidently without knowing gathered 96 corruption but the game automatically ends if you get to 100. Can i somehow decrease it without having to restart the entire work week?

what dose the good ending in the 5 th part of the war look like and  is the bad ending when thane is to busy to talk to the player

Thane is always busy to talk after the war what can I do?