- You may be looking for Zeti.
Yetis are legendary creatures, which were the scariest monsters in a book once read by Tails.
When a young Tantaror wanted to keep Sonic and Tails as pets, he conjured up a Yeti after Tails mentioned it. When Tails further mentioned the Yeti's tribe, the Tantaror created illusory versions of them as well. Although Sonic was confident he could defeat a single Yeti, he decided to flee instead of fight all of them at once. The Yetis cornered Sonic and Tails in a cave until Sonic uncovered the Tantaror's trick and they all disappeared.