Unity is a tank unit with its own buffs that increase its ability to survive and absorb damage received by our allies. But beyond that, it doesn’t do much. It has the ability to heal itself and withstand a fatal blow. It does little damage, as it’s not designed for that, but that damage can penetrate shields.
With maxed skills, Unity gains 3 Coralscale stacks from his basic attack and 5 stacks from Divine Pillar, which also deals 200% P.DMG to all enemies. Each Coralscale stack grants 15% DMG Reduction and absorbs 10% of the damage received by allies. With Coral Regeneration, he can heal 12% of his Max HP per stack and even revive with 20% HP per stack once per battle. His Phantom DMG scales with Max HP (8% per stack) and penetrates shields, though the total damage is still modest by current standards.
So, it’s really a unit that can help you increase your teams’ endurance, but there may be better options. I really want to know what the Awakened Cloth will do, since the Marine is really hard to see in PvP.