After turning in over 10,000 spellbooks to the library, I decided to post some data. I only kept spellbooks with a super slayer mod or 3 mods. About 8000 spellbooks were crafted with 110 real magery and 100 inscription, the rest were crafted with 100+ real magery (110 with jewelry) and 95+ inscription. All spellbooks were crafted w/o a talisman (50% create/5% execptional). Even at the 5% exceptional rate, I appeared to create 10-20 exceptional books per 120 (8-16%); never had less than 8 at 110/100 skills. Scrolls used: about 150,000 Super Slayers: 2 Arachnid 2 Demon 2 Elemental 4 Repond (1 also had +5 intelligence) 0 Reptile 1 Undead No other mods on super slayers other than the 1 Repond. Books with 3 properties: about 85 Only recieved 1 spellbook with 3 skill mods (+11 magery/med/eval). Much rarer than super slayers but they do exist. If there is a statistic I passed over that you would like info on, I'll try to estimate my result. I encourage others to keep approximate results of their crafting and post them here. May the RNG be on your side.