Grimhowl

You must be on a Dark Iron Dwarf at level 50 or higher who personally earned the Heritage of the Dark Iron achievement by leveling from scratch — race-changed or boosted characters do not qualify, and the quests must be completed on the same character that earned the achievement.

Open your general spell tab and use your Mole Machine, then select Eastern Kingdoms followed by Shadowforge City to travel directly into Blackrock Depths.

From your arrival point, turn around, walk forward, head upstairs, and follow the path on the right side without jumping down to reach the quest starting point for The Anvil-Thane's Designs.

Locate the NPC in the Grim Guzzler, click her dialogue, select "brawl", and defeat the Risen Ghoul in the fight.

Go down from the Grim Guzzler and kill Boiling Flamebringer to obtain the Boiling Flamecore.

Return to the ramp you came from and collect 5 Darkforged Ingots, which are scattered across the large marked area near the Warbringer Constructs.

Follow the path until you reach Kasea Angerforge and ask her for the Flamepoint Engraver to continue the questchain.

Finish the remaining steps of the questchain to receive Grimhowl's Face Axe, which teaches you the Grimhowl mount — note that the mount is currently only ridable by Dark Iron Dwarves.