ToME: the Tales of Maj'Eyal

Yes, the original requirement is 20, and you can improve it at 21, 22, 23, 24. I found out what the problem was though - I was wearing a belt of unlife - which treated me as being undead and therefore unqualified for it.

I haven't been playing all that long, and this is my first run through with a necromancer so I'm not certain if this is a bug, or if I'm just doing something wrong. I'm pretty sure it's a bug though. I have completed the From Death, Life quest, and my quest log states that it is "done." I ...