He lost some of his magic when he arrived here. Back home he's...

[Pausing, he tried to think of the best way to explain it but the first thing that comes to mind is his boyfriend's 'Better than Gandalf' coffee mug or the debates over Dumbledore vs. Magnus he's heard.]

He's one of the most powerful warlocks in the world.

[His expression falters slightly. Some of the light that always brightens his eyes when he speaks of Magnus dims.]

He gave up a large part of himself to be here with me.