Necroblimp

The Necroblimp is a black MOAB littered with eyeless ZOMG skulls. It has a 0.3% chance to appear in place of a MOAB every day you don't play a track. After a month, the chance of appearance dramatically escalates to 20% and stays like that until you play the track again. Keep in mind that it only appears on said track, and will not leave until you play the track and leave, regardless of if you encounter it or not. Anyways, on to the stats.

Stats
This blimp has 500 health, twice of a M.O.A.B. It moves at the speed of a Lead Bloon, slower than a M.O.A.B.. It will only appear after round 70, once. Yes, only once. It has 2 special abilities:

Bump: Spawns a random non-boss bloon/blimp that you haven't encountered in at least 5 days and at most 30 days.

Necrobump: Spawns a random non-boss bloon/blimp that you haven't encountered in 30 days or more. 10 random bloons from Ceramic Rank to Micro Rank will be trailing it, yelling at spawned bloon/blimp because of its necrobumping.

Trivia
Obvious reference is obvious.