So I've been watching the Smiths hurl their magma in the last few months and it looks like it may not be worth sending them along for just magma spam. The problem with a drain domain is that (I'm pretty sure) it gives everyone higher magic resist in combat, even the enemies, making it hard for the Smiths to do damage. It's still worth having some around for buffing the troops, and some of them have higher accuracy from experience which makes more of their magma bolts find a target. Plus, then I get some good heroes out of it too:
The damage from magma bolts doesn't have a MR component. Quite a few spells, especially th'elemental evocation ones, don't, so drain isn't going to do much to the damage output. In any case, the smiths shouldn't be effected by the drain component at all, unless they're using spells that can be resisted.
I'm having trouble figuring out what better to have 2e1f mages spit, though
If you've got some of the 1 in
1030 (or something like that) 2f ones, they can spew fireball, which is pretty spiffy. Alternately have some of the (very) rare astral ones spit out some communion stones, maybe. You could do some killer stuff with that. Or, if you got the spare gems (and are willing to risk the boosters to combat), slap some earth shoes on the mages. Gazing over the spell list, a lot of the lower earth buffs (earth spells, period) are 3e.
That +MR spell's in Thaum 4, and your 2e mages could cast it. Might be able to get some use out of iron warriors if you've got alt 5, since it only needs 2e to cast. Beware anything spitting lightning, though.
E: Script summon earth power to those mages! Well, if you have th'spell. S'conj 3. If you had that, those mages could do quite a lot more without any forged boosters. The reinvig wouldn't hurt, either
E2: Double checked. Y'ain't got conj3, or... much, really. Conj 3 would be a good idea for a next research target!
As an aside, your bloody LP got me playing Dom3 a bit, again. A pox on you, for it chews up great gobs of time