How are respawning NPCs explained through lore?

[Brut]

Lendiniara the Keeper says 'Enter into the halls of testing to complete these tasks. Seek out the ancient ones inside and see if your might is as great as theirs and fear not, those who you slay will be returned to the temple by the gift of Veeshan's great power. I have three tasks, which any may complete, as well as a request of both the arcane and the strong.'

Lendiniara the Keeper says 'Those who believe they are strong may be surprised after such a task. Seek out the cursed one and slay him, return to me when you have gathered a Silver Tear, a Poison Tear, a Flame Kissed Tear and a Serrated Tear. End the cursed ones torment for a short time, before the high priest raises him to continue his suffering for eternity.

Confirmed all Vee's doing.