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BASE THACO - 255 (to which -4 wraps)So the amount you need to hit is abysmally low- i.e., an auto-hit. Using a -5 Missile THACO item I saw an improvement from +8 AB to + 263 AB in the To-Hit combat feedback for missile weapons only.
BASE THACO + 4, thus raising the THAC0 value to make it more difficult to hitNOTES:
73- Attack damage bonus- negative wrap to +140s for all damage- melee, missile, fistI confirmed them all to make sure of the same negative wrapping issue by creating items with each one at -5 penalty and all of them giving an excessive bonus.
284- THACO bonus (with an "O", not a zero)- melee or fist only
285- Melee weapon damage bonus- melee or fist only
286- Missile weapon damage bonus- missile only
288- Fist thac0 bonus- fist only
289- Fist damage bonus- fist only
305- Offhand (melee) thac0 bonus- fist only (tested by @Tanthalas)
306- Main hand (melee) thac0 bonus (though this effect is listed in NI as "Unknown")- melee only
54- thac0 bonusThen I tested all of the above including the original Effect 167 using an .ITM which instead used Timing Mode 2 (Instant/While Equipped) with exactly the same results.
219- attack roll penalty
278- thac0 bonus