9th level divine soul sorcerer(or cleric) / 11th level warlock, with access to animate dead from cleric list
take a short rest
use all your spell slots on animate dead.
take another short rest.
@curious_penguin does have the closest thing to a general rule I know of. However, lifesense gives us several hints it is precise, even in the Aiudara Wraith.
First hint is from the ...
It probably is a vague sense.
Pathfinder Roleplaying Game Core Rulebook has a paragraph on vague senses and at the end of it it says:
Pathfinder's rules assume that a given creature has vision as its ...