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Throne and Liberty Shadow Skoll
Morph

Morph
Mobility
Dash
The Skoll is a type of Wolf that lives on the plains of Laslan. While Skolls are primarily known for their strength and toughness, some of the elites of this species are equally feared for their incredible speed and stamina. Unlike common wolves, which live in packs, Skolls prefer to live alone. They are also Mythic Beasts and glow green with the energy of earth.
Shadow Skoll

Similar to the Wild Skoll, but with a more groomed appearance and a gray-white coat. 

Shadow Skoll Dash Morph in Throne & Liberty
Shadow Skoll Dash Morph in Throne & Liberty

You can unlock the Shadow Skill by completing the Adventure Quest At Henry's Grave in Chapter 2 of the Adventure Codex. 

Mobility
Dash
A Morphstone containing the power of the Wild. The power imprints onto your body, enabling you to morph.

Sources

Shadow Skoll

Related Morphs

Long ago, Skeleton soldiers appeared on the battlefield marched on and on, armed with weapons and armors stripped off from other fallen soldiers. These undying, victory-craving Skeletons became the frequent topic of nightmares.
Skeleton Soldier