FMIB

The FMIB is the Frequently Modified Immunity Blimp.

It is relatively little of a threat, at 500 and the speed of a BFB.

However it has an immunity to a random tower, after 10 seconds it changes the immunity to the tower that damaged it the most in that 10 seconds, it keeps doing this until its demise.

Upon its destruction it releases a single moab with the same effect.