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If the imperial tombs only make ghosts, what are the requirements for an empire to spawn a warden after they fall?

Also I meant, can ships plot new starpaths entirely?

No they cannot plot paths between stars that are not already connected

Ah good question, you will be the first I tell :) Wardens spawn only for empires which have controlled the galaxy, and even for the it's only a 10% chance once they die.