Level 6 spellcraft, and spell levels are around ~5 for the few I’ve played with? The time to level them further is already becoming prohibitive given the minimal gains I’ve seen for leveling them so far.
For a minute of spellcasting time and self injury I’d need to summon something a LOT more powerful/numerous than basic zombies or skeletons to even remotely compare to the kind of slaughter I can lay down by just punching enemies or laying about with a fire axe that entire time - especially when you consider that basic Z’s are incapable of hurting most of the medium or higher level enemies. I don’t know if any number of basic zombies can realistically harm a single soldier zombie, never mind a kevlar z or anything actually dangerous. At best they’d act as weak meat shields.
So part of the problem is that the necro spells offer close to zero utility, even if they had 100% cast chance, in 1 second, at no cost (forget an 80% fail rate, after 60 seconds and self injury). I really haven’t experimented to figure out why my fail rates are so high, because the idea of summoning a single basic zombie just isn’t worth the effort.
I’d say the biggest problem with the summoning spells starts with their cast time. You don’t have a full minute to cast a spell in virtually any conceivable instance of real threat in CDDA. That’s 60 turns standing there doing nothing, which is suicide in any remotely hazardous condition, so the spell could automatically instantly kill everything on screen and it would STILL be next to useless (much like a mini-nuke, now that I think about it. ).
Spell balance must keep in mind the fact that a mid-level survivor can pretty easily put down 40-60 damage per second in melee, plus disabling effects like knockdown/stun, and a min/maxed endgame survivor potentially a lot more than that with strength bonuses, extra attacks and the like, so even minor spells that buff the survivor will be very effective - but spells that replace melee or gunfire have to be far more powerful to compete for that time. So in 60 seconds I can either summon one basic zombie, or do ~3000 points of melee damage…
Then there is the light spell, which also appears to be a creative way to commit suicide at night. Nothing like a wisp to follow you around and constantly illuminate you for several minutes, that you can’t get rid of. Being able to target an ENEMY with a light spell that would illuminate them for the next couple minutes on the other hand, would be fantastic. Night Vision or Telepathy style spells would of course be very useful.
The only other book I have is a paladin book I got, which I assume I’d be incredibly bad at using because I chose animist - I haven’t even been able to learn a spell from that one yet after a few tries.