"Fah! Tis' bad luck you would break the ring, human! It's only open once a new moon, and yer on the Avelon side nau'."
Shivering, you gasp "Who's there? What ring? Show yourself!"
A shadowy form comes up to the wall of darkness, letting you see a horselike shape beyond. "I am but a humble pooka, lad. The ring is a gate formed by the mushrooms ye stepped over. Breaking it in midcrossing has made it as stable as mud. Ye need a fay's help to cross alive nau', an' I'm the only one near ye. Unfortunately for ye, I need to change ye to one of my charges ta pull ye through. Do ye accept?"
You nod "Like I have a choice?"
you hear a whickering giggle "Actually ye do. Do ye prefer unicorn, pegasus, or regular horse? Of course, castin' through the wall might do odd things like making ye a mare, but as ye say, we have nae' choice but to see what happens."
You are so overwhelmed by the thought of becoming nonhuman, you cant decide. "Your choice. I'll have to trust you."
You feel a sudden tingle as white hair spreads across you. Your clothes shred as your body reshapes and swells. a naked tail sprouts then is covered in long hair, even as your headhair spreads down between your shoulderblades. you drop to all fours on fusing, stretching fingers and toes just before a pulling sensation brings you into sunlight and intense smells of nature.
You look up at a horselike person, standing upright on dark hooves and wearing an old Celtic style body kilt. He gives a horselaugh, and points to a nearby forest pool "Am I such an odd sight? Nae more than ye be then or nau? Go look!"
You stagger on all fours to the pool, not even wanting to try standing upright as you go look.