Scariks 40k Rules
Games Run By Scarik
Forlorns Hopes and Immortal Evils
Corruption
When you gain Corruption subtract your Corruption Bonus from the amount gained. Minor exposures can be reduced to zero, Major exposures will have a minimum value if necessary. Corruption from time spent absorbing Warp energies will be modified. If you would normally gain 1 point a day in a particular place then you will instead gain 1 point every (1+CB) days spent there.
Some awards will need to be adjusted to compensate, but for the most part this will make you need greater and greater exposure. Eventually summoning lesser Daemons just won't affect you, etc. My main inspiration for this is that Abaddon is not a Daemon Prince.