N'aix the Lifestealer

Current story:
There once was a man in Lordaeron so consumed by greed that he was beyond remorse. Eventually caught trying to steal Prince Arthas' sacred ring, he was tried and hanged. Yet his body, so corrupted by his desire to steal, had risen by itself in the form of a monstrous ghoul. So came into being N'aix, his old name long forgotten: the embodiment of lust and greed, bent on stealing the life of every living creature he encounters.

Hero info:
Strength Hero, N'aix's focus lies with stealing life and consuming his enemies a little at a time with each attack. Remade from his previous incarnation, he can gain both attack speed and magic immunity together (although in short bursts), but his most notable ability would be to infest non-hero units and travel along with them, only to burst out at his own discretion.