The two last bosses were the soccer ball and the purple ball that currently sit in the tower and they gain the power of every guardian they touch.
Edit:
Oh my god. The ball has already taken its second form. This is progressing much faster than I thought.
English
#Destiny
-
The Tower is a testing ground for the contest between the Speaker (whose name is Jacob) and the Man in Black (who is also the Darkness, or the Smoke Monster). Destiny is a re-telling of LOST. Next year we get to meet The Others.