KOTS

Desired behavior below:

• Hitting/killing a monster leaves a pool with fluid (item) corresponding to their "race". If the monster has a race that does not have a corresponding fluid, no pool is created.
• Hitting a monster leaves item 2889 on same tile. Killing a monster leaves item 2886.
• Each of those item decays to next state after some time (fluid enum should be preserved when item is transformed into next decay state).
• There can be up to one after-hit item and one after-death item, so when a new item is created, remove previous item (if exists). Only remove previous item in same decay state.