Shadow Word: Death: Its backlash deals 30% of your maximum health instead of 10%.
There is zero chance SWD stays like this. If it punished you this hard, players would begin to anticipate and deliberately counter with a shield/barrier, ice block, divine shield, shadow potion, grounding totem, etc, and it would be absolutely devastating to the point that you might hardly ever use it in PvP. And killing yourself from SWD will become a meme. No longer worth the risk, especially considering how little damage it does.