Fastest way to get rid of karma ?

I 've realized that i don't need a pk toon.So i decided to make it a zaken and istina box toon (It's dual 91 lvl).I have been killing and rezzing it with a healer for 2 hours but only 200k karma i 've cleared so far.There is still 2m left and my head aches.

Any better way than kill and rez ?