Native to Arvandor, serren trees serve as vessels for nature spirits. Branches that fall from serren trees can be used to create bows, arrows, or crossbow bolts with the ghost touch property due to the portion of the tree's spirit still within the branch, though they do not emanate magically. Branches cut from a serren tree, however, quickly wither and die.
Serren has the same hardness and hp/inch as normal wood, and provides a price modifier of +4000 gp when used to create a weapon or object.
- Book of Exalted Deeds, pg.38