Doomsday event

welcome. this idea popped up in my head while i was looking at events for terraria and thought to myself "hay, this seems like a good idea and maybe others might think so too!" so my idea is an event that triggers rarely after you have defeated every boss in terraria. when the event begins the moon/sun will turn black and the sky will become red, along with the description "doom has arrived." when doomsday has begun the event will last until it turns day/night. as you should be aware of the event will happen at either day or night. i'll start on monsters soon.