Where an item drops and what a monster drops. Data straight from the server.
Chance per kill at server rates (drop and spoil x3, x6 with Premium Account). At most one item drops from each drop group per kill — already accounted for. Level difference penalty and party bonuses are not included. Spoil — on a successful Spoil. Premium Account does not affect raid boss chances. Adena at x3 rate, twice as much with Premium Account.