Are ships able to plot new paths to stars after some time? And when are lunar monuments going to be given an effect?(Also do imperial tombs have an effect?)
1. Ships (most) should always pick the shortest path
2. They have the effect of making the emperor feel better :) (in theory) They also attract traders, so there is actually a positive side already
3. Yes, when a high level imperial employee dies, they get a "Ghost Ship"
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?
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.