Since my polymorph meme has only garnered three downvotes so far I thought I'd offer a bit more controversial take, and see if I can manage to stir the pot a bit with this one.
Nature is rather fond of its laws and so decides to perturb you right back.
"Your character has started to understand and unlock the secrets of undeath. Do this again and you may need to find a phylactery quick, because each time moves you one step closer to becoming a lich"