NORMALWeighted random — exactly one item drops; each Chance is a relative weight (chance = value ÷ group total). Optional 4th col = rare %.
PCTIndependent — each row rolls its own % out of 100, several can drop.
QUESTGroup Vnum is a mob vnum trigger; the real chance lives in the quest script, not this file.
SPECIALWeight/sum like normal if opened; really an attr-binding table (count col = ATTR group vnum).
ATTRNot items — each row is an attribute (apply-type + value), plus an optional effect file.