Troll build for Sen's Fortress.
Invade and head right to the first fog door (By the long outdoor walkway, with boulders rolling down it)
When you see someone approach, either:
1. Cast TWoP, spam Force, and watch them get hit by boulders or fall
2. Cast Karmic Justice, block, and wait until it activates
The Sack's just for show, and you could probably go higher level if you really needed too.
Enjoy!
