Expect Peryite cultists, ogres, and giants to hamper your progress to the windy summit through dank caves and glowing toxins. Try not to die from the plague! And what do you get for winning? Death-themed woad tats, for a start.
“Should you survive the final battle and stand victorious atop Scalecaller Peak, you’ll earn a host of unique rewards. These riches could include the Blackmarrow Necromancer skin, earned by completing the Scalecaller Peak Challenger achievement; unique Trophies and Busts for completing the dungeon on both Normal and Veteran mode; and the Renegade Dragon Priest Mask, earned simply by entering one of the two Dragon Bones dungeons.”
Source: Official site