My nephew once asked me "What colour is unicorn blood" (Harry Potter related I think), we decided it was rainbow coloured. So that is where this idea came from. Sometimes we all need a little wonder in our lives.
The text says:
Whole Unicorn Blood, Permitted Uses: Bigfoot, Centaur, Dragon, Dwarf, Elf, Fairy, Faun, Genie, Giant, Gnome, Griffin, Hippogriff, Leprechaun, Mermaid, Nymph, Pegasus, Phoenix, Pixie, Sprite, Unicorn.
Prohibited Uses: Banshee, Chupacabra, Cyclops, Djinn, Gargoyle, Harpy, Hellhound, Hydra, Imp, Jabberwock, Jersey Devil Kraken, Lich, Medusa, Minotaur, Mummy, Troll, Vampire, Wendigo, Werewolf, Zombie.
Mythical Beasts Only
We wouldn't want to waste something so precious on the bad guys :)