About the Trapawner, a troublesome cave monster

The Trapawner spawns in caves. Whenever a Zombie is about to spawn, there is a 5% chance that it will be replaced by a Trapawner instead. The Trapawner has the appearance of a spawner fused with bat wings and a skeleton head. It flies using its wings, behaving similarly to a parrot. The Trapawner absorbs one nearby mob from the following list: Zombie, Skeleton, Spider, or Cave Spider. It can only absorb one at a time. Depending on the absorbed mob, it will summon that type of mob repeatedly, similar to a spawner. The Trapawner has 18 health and does not regenerate naturally. As its health decreases, its appearance becomes more damaged, similar to an Iron Golem. When defeated, the Trapawner drops an item called Trapawner Feather. This item can be used in crafting. If Trapawner Feathers are placed around a Happy Ghast harness in a crafting recipe, the harness is upgraded into a Feather Harness. When equipped on a Happy Ghast, the Feather Harness allows it to fly at the same speed as a running camel. The Feather Harness has a slightly darker color than the original harness and features Trapawner wings attached to its sides. Finally, if the Trapawner is killed by the explosion of a charged Creeper, it will drop a Trapawner Head.