[Fantomen]

I'd say e9 is too expensive for the sepulchrals, considering they are enc 0 and have no use for reinvig.

But since they are not lifeless they get great mileage from a light/medium nature bless, n6 gives them regen 7! That makes them worth summoning over wights, and as agartha you want n for diversity too. The tomb oracles also get regen from n bless.

What I like is to take a lord of rebirth with e4d2n6. You get regen for sepulchrals and oracles, reinvig for your mages, lamia queens and fairy queens for great diversity, extra death and nature gems and a mandragora factory. (5+8=13 mandragoras per casting 15 with a thistle mace)

mandragoras scales with your national attack buff and mixes in size with sepulchrals to fill up squares 4/2, cold aura + attack buffed sleep vines from each square is nasty, and most attacks will hit the regenerating sepulchral.

nature bless is nice for your old mages as well, as they can use shrouds against disease,