Amadri Ironbark

Once the renowned Elf Lord Amadri Dawnspear, Amadri Ironbark was tortured to death by vile Daemonettes. So eager were they to ensure that Amadri experienced the full measure of their tortures, the Daemons placed a curse on him so that no detail of it would ever escape his senses. They soon came to regret this when Amadri’s mortal form perished, for their enchantment bound also the Tree Kin he became in the hour of his death. Fully aware of his fate and of his tormentors, Amadri soon took cruel vengeance of his own. Now and forever haunted by a pain he no longer truly feels, the reborn Amadri Ironbark rules Arranoc still.

Source

 * Warhammer Armies: Wood Elves (8th Edition) -- pg. 50