[wintersteel] how does death work?

So I'm starting bloodlines and I'm a little confused why akura fury or malice don't just resurrect everyone that died at the end of wintersteel

We've seen monarchs have that ability, northstrider did it multiple times during the tournament

So what's stopping any other monarch from doing the same? Is it a matter of skill or some artifact or something that needs to be prepared ahead of time? Is there a time limit to revive someone before they cant do it?

Why can't simply restoring the body, an ability some sages can do easily, not restore someone to life?

I'm assuming I'll get answers once Lindon reaches monarch and ascends to take azriel's place. (My theory at this point)