Some magic exists that can heal fatal wounds if they're not... too far gone. But the Dead where I'm from aren't fully gone. If you know how to reach their Realm, you can visit them. If one has the courage. [Hel is really not for the faint of heart.] Gods have been known to bring heroes back to life, sometimes. In the old tales — I haven't seen it for myself yet. And then there's the... undead.