Battle rage

Erik was lost in his lust for battle. This was his kinds great purpose, to wage war and to crush all before them. Allies shivered at the sight of a fully enraged Jotun, foes quaked to see their gaze fall upon them.
Although Erik tried, there were limits to his control.
The Valkyries promise had broken that control.
This was his true form, bathed in the wrath of his ancestors. It wasn't magic, so much as a curse given to his people.
Grabbing bits of rock as they fell, he roared with each volley he sent at the Valkyries.
"DIE CURSED MISTRESSES OF THE DEAD GODS, LET DRAUGR FEAST ON YOUR REMAINS, IF ANY ARE LEFT!!"