These consumables have miscellaneous effects on players or enemies.
Most of these items still exist, but can no longer be obtained as drops or as purchases from the Nexus store. Most of these items were released for special holiday events. Historically limited edition items can be found here: link.
Coupons are stackable items. Players can double-click on a full stack of coupons to exchange it for another item.
Mystery Bags turn into a random item when used, which depends on the type of bag.