ToME: the Tales of Maj'Eyal

Hey, and what about nightmare difficulty? I've tried stealth, but even with 5/5 in this skill almost every enemy can see me (in tier 1 dungeons? i'm lvl 15 with 47 points in stealth). Should i take stealth later on, or on nm it's useless, becuse of enemys always have more lvl and see stelth than you...

Hi! I'm trying to beat ToME on nigtmare/rougelike difficulty. So right now i've only managed to get to lvl 26 on tri-beam cornac archmage with all possible shield that I can get and then was YASD happen to me on 2th lvl of Melinda's crypt, couse of my own arcane shtorm and (surprise!) ring of ?eleme...