According to the spell-binder legend Patricio Silva, securing the Twelve-winged Water-Pegasus would have been easier if he had allied with a herd of two-tailed demon soil weasels. This was because the two-tailed-soil-weasels were creatures that were born as Grade 8 demon pets. That fact meant that a newly born two-tailed-demon-soil-weasel could be a formidable foe. Unfortunately, those demon pets stayed on that level for the rest of their lives.
The second factor that made those demon pets formidable was that, unlike other demon pets, they could constantly use spiritual attacks on their opponents without suffering any backlash. The "demon" in their name signified their ability to use spiritual attacks.