What is a reroll?? I can not see anywhere in the rules where it says what they are.

A reroll is something you can use to change how your horse looks. However, it will not change their genetics. You can get different variations of patterns they already have, a different kind of appy if they already have an appy pattern, or a more special variation of chestnut, bay, brown, palomino, buckskin, dunskin, or grullo if they already are one of those. You can reroll chimera, sooty, and vitiligo on and off, so be careful! Brindle will stay, since it's related to genetics though not a gene itself.

Alright! Thank you so much!