It's also possible that during that year he developped an ability to restore his mana levels from many sources, the slow ones taking up to 3 days.
I can think of earth/air connection. Just being there he can charge.
And maybe there's his new connection to all the goblins and direwolves. Naming them costs a lot, but then he gets energy from them.
Its very possible that the scene where the goblinas carres him had other meanings than just useless worship.
It's a common trope: Gods get power from their worshipers.