Ah, good point, the mages would use that on the largest creature in range, and potentially stack it.
Lets look at the major anti-thug spells.
Petrify: E5 MR negates instant death
Maggot: N1 1 gem Anti-undead poison
Ravenous swarm: N3 1 gem battlefield Maggot each turn? (I never got around to testing it)
Disintigrate: D2 MR negates instant death
Infernal prison/claws of kokytos: B3 F1 or W1 they are gone for a year with a chance? of dying
Life for a life: B3 large amount of unresistable damage
I can see why you would kit the mummy out to be that way. There is no blood nations in the game unless they have managed to develop into one.
etgfrog: 15. We're not all Ulm, or even earth-heavy. Sorry, but the rote "forging cost = forging cost - 2" presumption that crops up in sooooo many online discussions is an irrationally irritating pet peeve for me.
Ok, I generally operate by assuming then plan for the worst and hope for the best. The worst case would be you managed to acquire a dwarven hammer. Unlike single player games, trading and scheming is a thing in multiplayer. There are 3 nations in game with that kind of earth access, you also have minor earth, although the chance of you getting E2 is very slim. It is entirely in the realm of possibility of you having a dwarven hammer.
But this is avoiding the elephant in the room that is tartarians with a shroud are very cheap for the power you get. Especially when the counters will be 1 time use due to blood vengeance. Factoring a rather generous 25% of them will effectively be useless puts it at an average cost of 13 gems per usable tart, add onto 1 of the tarts is a flying man eater with only a helm slot bumps it up to 15 death gems per thugable tartarian. Throw on a shround for 5 astral gems, so 20 gems. That is still insanely strong for the cost.