Skeleton trap boss event

The skeleton trap event, also known as the four horsemen is a very interesting event, but sadly is overlooked.

My idea is to turn the event into something more significative, such as the raids. When triggered, an event bar similar to the raid one appears. It displays the health of all four horsemen spawned, that now, would be stronger, with more health points than a common skeleton (and possibly wither skeleton sized). Once the last horsemen dies it may drop an special item, or maybe an special enchantment only acquired through the completion of the event.

Not a very big change, just enough to make it a relevant event.