Wings, Horns, and Hooves: The Ultimate Unicorn Mod
Adds unicorns, pegasi, nightmares, destriers, and other new horse breeds that you can crossbreed to make new variants!
Nightmare
A nightmare creates fire wherever it walks (but the default fire doesn't spread and doesn't burn you unless you change a setting).
Nightmare fire trail
Nightmares even leave trails of fire in the air you fly them through.
Pegasus
A pegasus from the front.
Unicorn
A picture of a unicorn from horseback.
Destrier & Pegasus
A destrier (a large, powerful warhorse) and a pegasus.
Rainbow Smash
From the back of a mutant breed, Rainbow Smash (you can get one by crossbreeding unicorns, pegasi, nightmares, and destriers).
Wing Buffet
This rider is making their pegasus perform a wing buffet attack on some pigs. Wing buffeting is a kind of attack in which a winged horse flaps its wings at an enemy, blowing it back and possibly damaging it.