I.D.B.

The IDB, or Incredibly Defensive Blimp, is a bloon that appears in BTDP. It has 50 health, 500 AD, and releases 4 Armored (a property that gives a bloon 5 extra AD) Lead Bloons when popped.

Weaknesses
Not many towers do more than 500 damage, but a couple abilities do. Here ares some towers that can kill it:
 * The God of Eta Carinae (6/x/x Supermonkey)'s sun beams do 750 damage. However, it is incredibly expensive.
 * Tech Terrors, Anti-Bloons, and and the Ultimate Bloontron (x/4/x, x/5/x, and x/6/x Supers) have abilities that each do more than 1000 damage, so they can instantly kill one of these.
 * Monkey Pirates and Pirate Lord have abilities that can take down a MOAB-Class bloon weaker than a BAD, so these can insta-kill them as well.