The most powerful horses in the world are foals in comparison with Sleipnir, the ultimate horse.
Nordic myth states that this eight-legged horse was born to Loki, god of mischief, when he disguised himself as a mare to distract the workhorse of a giant who was building a wall and was coming close to finishing, which would cause him to win a deal that the gods were not content to lose and prepared to further sabotage through the strategic placement of Thor's hammer Mjöllnir into the skull of the giant and blah blah boring fight scene etc etc
Long, weird, story short, Sleipnir is an awesome horse, and anything named after him better be equally powerful and cool.
This seems to check out. Joel Larsson is to thank for this vessel that holds-and is worthy of-such a significant name.