Dreadmare of a Thousand Truths

"Servants who earn Vaermina's trust may be gifted this loyal dreadmare. Their first ride from Quagmire takes them on an eldritch path, as the hands of the beast painfully claw out every flaw along the way."—Excerpted from "Paths Through the Mire"

Source: in-game description.

This model has additional visual effects applied to it in-game.