Weight-picks one affix from a table - the same "roll whether, then weight-pick which" shape rollLoot already is, with a single entry reading as "always this one".
rollLoot
null when the table is empty or every entry has weight 0
Weight-picks one affix from a table - the same "roll whether, then weight-pick which" shape
rollLootalready is, with a single entry reading as "always this one".