exasperated
Unless you mean that the growth penalty looks upon the system and sighs, mildly upset by it, I think the word you mean is "exacerbated".
The caster sacrifice does sound overly expensive to me, but it's a suicide spell on your first magical tech; you can't really expect it to be all that powerful. At eight potential points of damage after they're already dead
Very true. Get an academy, crank out two units of no-equipment Kamikaze a turn, and you're set.
Wait no, that strategy sucks balls. I forgot you needed blessed obsidian for it. And I thought it gave 8 damage, not two strikes. So I'll have to think of a new one... but it's still good, let me do the calculations.
Okay, 1 labor, 1 iron, and 2 wood makes strong iron. 1 strong iron, 1 labor, and 1 wood makes steel. 0.5 labor and steel makes steel armor. So all in all I have 2.5 labor, 1 iron, and 3 wood, which makes 2.5+0.5+1.5=4.5 labor per steel armor. For a similar quantity of labor, you cast Black Sludge on your units. We each start with, say, 7 attack and 7 health. I get boosted up to 21 health by my armor. We attack and my unit kills yours on the first turn, but then gets attacked twice and dies. So really, steel and Black Sludge are about the same. Sure it's a bit worse, costs a bit more labor. It is also a bit situational (though not really); if you have 300 attack and 1 health, Black Sludge won't help much. But that's to be expected for an early tech; I had to go through a massive tech chain to get Steel.