The Ent Blackthorn is disturbed by the emergence of Black Huorns from the heart of Fangorn, which do not heed his voice.
'Little ${RACE}, this black heartwood concerns me. No natural ailment afflicted it. Hoom, I need more to study. Bring me the heartwood of the Black Huorns, so that I might determine what evil has come to this wood.
'Ta-rum, if it is as widespread as I fear, much of the forest might be ruined....'
Black Huorns may be found throughout the eaves of Fangorn bordering the Broadacres.
Blackthorn asked you to bring him more of the black heartwood, so that he might learn the origin of the corruption.
Blackthorn awaits your return in the eaves of Fangorn, bordering the Broadacres.
You should bring the black heartwood that you collected to Blackthorn the Ent.