From A Wiki of Ice and Fire
Nightwood is a type of black tree found in the known world. it is unknown if there is a connection with the ebony of the Summer Isles, the ironwoods of Westeros, or the black-barked trees of Qarth.
Sandoq the Shadow carried a tall black shield of nightwood, boiled hide, and iron.
- ↑ Fire & Blood, The Lysene Spring and the End of Regency.