Castlevania: Circle of the Moon/Enemy data

Stats in parenthesis are for the versions found inside the Battle Arena

Item drops
All enemies, except for bosses drop two items: a common item and a rare item. Bosses never drop anything and the Battle Arena versions of enemies drop the same items as their common counterparts. DSS Cards can only be picked up once.

The actual probability of an enemy dropping an item is determined by your luck (LCK) stat. The formula to determine the probability is:

Probability = Rate + (Rate * (Luck - 100) / 200)

If you have a luck stat of 100 (the starting rate for the first four modes), the actual probability is the base rate. Drop rates are capped at 50% for common items and 25% for rare items. Luck does not effect how often enemies drop small and large hearts.