Angelic was once a Paladin's guardian, until the equipment that spawned him was abandoned in Dragonblight, Northerend. Later, three hundred years or so, Drasgar, a human Paladin found these attachments and put them on his sword. From that point on, when Drasgar called out: Angelic! I summon you! Assist me, and may the Light win! he'd come to life, and start fighting guys like a massacre.
However he could only do this a matter of time, and he was only used in emergencies. Such as when Drasgar and his possible friends were surrounded, he'd attack them, and they'd die faster than usual.