Crow Jamian is a high-risk single-target healer designed for emergency stabilization. At max skill, Sacrifice trades 25% of his current HP to heal one ally for 280% C.ATK, while Raven Storm can sacrifice 90% of his own HP to fully heal one teammate. His passive [Raven Ancestor] helps sustain this pattern by returning 14% max HP to Jamian when contracted allies take damage again.
In practice, he is a niche pick for early accounts that need clutch saves rather than efficient teamwide sustain. He can rescue key carries in difficult PvE stages, but his self-damage pattern is risky and often outclassed by safer healers in competitive PvP. Good as a situational budget option, not a long-term meta core.