Durnehviir

Durnehviir is one of General Smythe's lieutenants and one of the strongest dragons in Smythe's army. He was originally trapped within Oblivion but when Smythe traveled over to the Elder Scrolls Dimension, Smythe performed a ritual that severed Durnehviir's connection with that place an then brainwashed him to become one of his Lieutenants.

Immortality
Durnehviir cannot age or die of natural causes, though his body can be destroyed, although if this happens, he will reform within Oblivion and be able to return when Smythe calls him.

Flight
As a being with an immortal soul and body, Durnehviir is capable of sustained flight with his wings.

Necromancy
Durnehviir has dabbled in the dark art of raising armies of the undead to do his bidding.

Frost Breath
"Fo Krah Diin!"

Durnehviir can breath a jet of frost, unlike most dragons.

Drain Vitality
"Gaan Lah Haas!"

Durnehviir can coax the magical and life energies from his victims with this shout.

Soul Tear
"Rii Vaaz Zol!"

Durnehviir can rip a target's soul out and raise them as undead servants with this shout.

Soul Cairn Summon
"Diil Qoth Zaam!"

Durnehviir's necromantic shout which allows him to summon armies of the undead.