From Destinypedia, the Destiny wiki
Ozysas bears an identical resemblance in both appearance and gameplay as Basilius the Golem with the only differences being a lack of shieldbearer Champions and Ozysas having lesser health.
Ozysas will engage the Guardians from the entrance to the Imperial Land Tank, summoning Cabal with him. At half of his health depleted, Ozysas will summon an immunity shield and Portable Cabal Shield. Destroying the Portable Shield will disable his immunity shield, allowing him to be killed.
List of appearances