Darkness Bloon

The Darkness Bloon is a very nasty bloon with 50 HP. It appears in a random place of the screen and does not follow the track nor does it move. Towers will target it, however, everything except sun-based attacks tresspass and damage it. However, it has some abilities:
 * Solidify: Becomes grey and solid, so everything can damage it. However, it now has 350 HP. Lasts 5 seconds until it becomes dark again.
 * Shadow Move: Disappears and appears in another random place in the screen.