Maplehoof

Maplehoof is the name that Rose has bestowed upon her beautiful pony. Mother gave it to her as part of her Guardian Rubric: Ironic Indulgence attack. While Rose at first Abjured Maplehoof, it seems she's developed a small (obviously) amount of affection for her, giving her a pat on the snout, albeit in a begrudging way. After Rose entered the Medium, Maplehoof disappeared along with Mom.

It was later revealed that Mom took Maplehoof with her when she left the island. Maplehoof follows Mother's scent into a cave and comes across the aftermath of her strife with the an enemy of the Land of Light and Rain, collecting the huge amount of Grist left behind, sending to Rose's Grist Cache. The overflow is sent to the Grist Gutter to be redistributed to the other players. Maplehoof demonstrates a surprising amount of intelligence when she stands on her hind legs to be safely transportalized, following Mom to the ectobiology lab hidden in the Veil.

Ride
A secret page was added featuring Rose riding Maplehoof, with pictures spliced in similar to those found in Problem Sleuth's rude notes. The secret page can be found by clicking the horseshoe at the bottom right of the screen at the end of this animation.

Origin
Although Maplehoof's origin has yet to be discussed, she is seen with young Dave during The Reckoning. For a single frame Bro can also be seen riding Maplehoof after losing the Beat Mesa to Jack Noir.