The mountain slash lizard was a type of slash lizard, a land-going predator native to Safehold's mountain areas.

A fully matured mountain slash lizard could grow as much as fourteen feet long, including the no more than four feet long tail. Its long snout was provided with two rows of sharp, triangular teeth which could punch through even the most tightly woven mail. The long-toed feet boasted talons as much as five inches long.

They were fast, nasty-tempered, very territorial, and fearless, mostly due to their inferior brain capacity: they would attack anything that moved, except for great dragons. (OAR)