Diablo

A table of probabilities is built The ratio 1/drop chance is used to compute a total drop chance A number is generated in the range 0-total drop chance A table lookup is done to find the associated item Item properties are randomly rolled Different table lookup may be built depending on the difficulty setting as well as the current act The rarity of an enemy pack may either change the random generator distribution or some other mean to modify the probability of higher quality items from dropping The pseudo random number generator is initialized each game and does not depend on the current time (to avoid issue with reading some timer which may have the same value over many iterations or may be slow to read) When an enemy is killed, we want to determine how many items will drop