The Black Bloon has 25HP (12.5 hearts). It moves at the same speed of a Green Bloon. The Black Bloon is also immune to explosions. It takes no damage and reduced knockback from explosions, so detonating TNT to defeat large numbers of these would be useless, it would probably do more harm to you if any! In spite of what is said above, Black Bloons don't spawn in packs. Did I forget to mention that it's small, and it spawns very frequently in the Nether? It may even spawn in packs of 6 to 20 in the Nether!