Skulk swarmer

This block found in the deep dark, kept in a safe place surrounded by a shell. When harvested it retains its form, and can be moved to a different location. Once placed in a suitable location, it can be activated. Bonemealing this block will create a skulk swarm, which is similar to a raid. The swarmer rapidly produces skulk blocks around it to defend itself. Then it summons skulk-themed mobs to attack the player. These come in waves, with the only way to lose is if the player activates the warden during this event. When the swarm ends, the player can obtain a warden head from the hollowed swarmer block.