Newbie enjoying undead, looking for advice

[Aleph]

Do either of you have strong thoughts on the choices between the two? My thoughts seem to change after every game, but right now Master Lich is looking pretty good for a long game - F/A/E/N 2 W 3 S 6 D 5 lets him start out as a site searcher, kick off the Naiad/clam economy, and move easily to S 9 or D 9 with items alone - and if need him for an SC I can always Wish him to power. Is including Wish in my strategies sort of besides the point for Ermor?

Aside 1 - is there a way to know which creatures are vulnerable to aging? Undead not, obviously, and I'd assume demons and any recuperating creature. Anyone else?

Aside 2 - How does the national spell Soul Gate work? It's not in the manual and its blurb isn't clear.

Aside 3 - every once in a while, when playing LA Ermor with dominion 10, I get a message that my troops have been beaten somewhere, and I pop to the location to find a place with reasonable amounts of my dominion way the heck in the middle enemy territory where I have never been. What's going on here.