Hat Trick was formally possessed by the dark star before Silent Echoes. While under his influence she was deaf and mute but that didnt stop her from dancing

She was technically not a real pony but a candle like creature made of shadow that was sworn to protect a filly named Reverie the daughter of the local mob boss. She has a right hand mare by the name of Nada and they protect the mob bosses mansion but mostly his daughter

Not him though he was totally kidnaped by the ex slaves he stole

Ouch

But hes not dead just doing "community service"

Anyways after the dark star leaves her body she regains her senses and she even helped in the fight against him to save Reverie

She used a giant scythe

It was rad