If you are a DM and want to use Zwi as an NPC without the trouble of reading pages of information, you can simply use the following as a substitution:

Zwi hem C11/M13; Int High, Wis 17, Dex 18; Treasure Many (R, S, Tx3, Vx6); AL NG; AC -7; MV 12; hp 43; THAC0 9; #Att:1; Dmg./Att.: 2d4+8/1d6+9 (morningstar) or by spell; XP value 13,000; SA spells (uses emotion control [ToM], lightning bolt, demishadow magic & magic missile for attacks usually), turn undead; SD Fails saves only on a 1, Protection From Evil (as 1st level priest spell) always active, double-strength Stoneskin (as 4th level wizard spell but 12+2d4 in number), spells dispelled as if level 17, does not immediately die when reduced to less than 0 hp (but falls unconscious), Mislead (as 6th level wizard spell) like effect when reduced to less than 5 hp, Word of Recall (as 6th level priest spell) once per month, Non-detection (as 3rd level wizard spell) always active; Special Vulnerability: If successful dispel magic is used on Zwi, MV 10, AC -3, Dex 12, -2 penalty to saves, no Stoneskin and Mislead effect, future spells dispelled with normal level.