Temple of Darkness

[Sombre]

I don't think it's even worth bothering to send a revenant.

The primary use for them is to monthly cast dark knowledge, btw.

[vfb]

You wouldn't take a free shadow and shade per turn (well, for the price of one revenant)?

It's a nice raiding force with a black servant and rod of the leper king.

[sector24]

I always put a guy in the province to enter those sites. I'm not sure if it's efficient (you're basically losing research points each turn to recruit units of questionable quality) but having a little army around is helpful when barbarians take a nearby province.

[Agema]

Probably worth it for a D1 mage, especially a summonable one like a revenant - it's not like you'll really be missing those 3 research points.