It is a very hard and dense wood, hard to work with, used by Hall Domaize, as a high end board. For as Iantine said you can clean off unsatisfactory work with out harming them. The ones in Bitra Hold were too thick for his needs. Full branches can support the weight of free standing Holds, it found in Lemos Valley up along Igen River, they have a deep root system. that can make holes that Out and About folks need time to have there dray beat to have room to move around. A younger Tenna thought the dragons rested on them, when she saw them hunting their meals.