S.H.I.E.L.D.

The S.H.I.E.L.D. (Super Harmful Indestructibility of Extreme Level Defense) Is a Semi-Blimp, Has A shield that Takes 2500 Hits to break, and The Blimp itself Taking 5000 hits to pop, and contains 6 B.B.F.s.

Abilities
Regenerate Shield: restores the 2500 hit shield.

Auto Repair: Restores 1000 HP.

Protection: Summons a 1000 HP Shield around another Blimp.

Bullet Barrage: It's only offensive ability, rapidly fires 10 bullets at random towers, each dealing 2 HP damage.