I am the Night, I am... Friendship?

Inspired by the scenario where Doomguy was in the same situation, "A Tale of Hell and Friendship." I wanted to keep the variety flowing, at least relatively speaking. You are one of Batman's proteges and were guarding Gotham with Nightwing while he was off with the 'League when some witch showed up from another world and sent you to a land of horses. Everything's so bright and colorful, a stark contrast to the dark grit you're used to, and you may or may not have turned into a horse yourself on arrival!