Slow down blood-drinking power loss
Blood-drinking power loss is very fast and makes it nearly impossible to build up significant bonuses on the blood-drinking artifacts. Silence of the Dead and whip of the vampire snake are pretty much the only good blood-drinkers, and solely because of their base power level. Fang and Hornet's Sting are particularly terrible, due to faster power loss for speed-boosting artifacts. I suggest making the rate of power loss 3-4 times slower.