An Ambassador from the Seelie Court
Monster Manual IV, page 172.
Frostthorn resembles a tall and slender humanoid, with curved, woody antlers, a lush mane of leaves, thorny spiked shoulders, and lichen covering his wrists like bracers. His eyes flicker with green light.
Frostthorn’s mother was a nymph who fell under a verdant prince’s spell, but delivered their child to the Seelie Court before his father could claim him. Frostthorn’s only talent seemed to be talk, so he became their ambassador to the community of Grandfather Oak.
Though he lacks the evil nature of other verdant princes, Frostthorn is too selfish and petty to embrace the goodness of his Seelie Court masters. No one trusts him, but he seems harmless enough. Whether he is truly harmless has yet to be revealed.
Illustration by Raven Mimura, from Monster Manual IV.