Permanent potion effect from leech

[albdag]

I probably was very lucky, but i managed to get an infinite regen potion effect by killing a spider that spawned with such effect (it can only happen in hard difficulty). I was using a sword equipped with the leech enchantment. The effect was not removed even after re-joining the world. Pretty cool, but maybe a little OP... By the way, I am a big fan of your mod, great work! :)