ITEM

Items have undergone radical changes. Items now have individual immunities, susceptibilites, resistances, item hitpoints, and item maxhitpoints. Items also only affect certain parts of your body, rather than your whole body. (In most cases -- there are of course exceptions.)

Item hitpoints (and maxhitpoints) are the new way of keeping track of how damaged an object is. This replaces the old system of AC-APPLY, which reduced an item's hit-dice/ac as it was damaged. If an item is damaged, it may or may not continue to function normally until it is repaired. If an item has its hitpoints equal to its maxhitpoints, the item is in excellent condition and will work normally.

Item immunities, susceptibilities, and resistances make the items themselves immune/susceptible/resistant to certain kinds of attacks. For example, if you have a wooden shield, that shield would be resistant to crushing attacks (from clubs, maces, etc) but would be susceptible towards fire or cleaving attacks. (fire-based spells, axes, etc) Red Dragon Platemail would logically be immune to fire, etc. You get the idea. Immunities are considered to be infinite STOPPING against that attack. If an item is attacked with something it is resistant to, it has double STOPPING, and likewise an attack to which it is susceptible, it has half STOPPING.