You made a deal with Death to become immortal, however she tricked you. The first time you die, you will be resurrected in a half-dead state. Your body will be atrophied and all your physical abilities will weaken massively. Your magic will also become closely aligned with Death, thereby making any life magic difficult to cast. Living beings will also instinctively distrust you. You will have hard time making friends. Beware of gods/spirits of death for they will consider you an abomination and may try to kill you. However no matter how many times you die, you will always resurrect in this half-dead state. Do remember, if you heal yourself from this state, Death will take hold of your soul and you will permanently die. And just like the man who was tricked by Death, you will also only remember about the immortality part and forget the drawback. Only after your first death, will you remember everything.