Ailanthus twigs are an item used in the quest In Pyre Need, and the subsequent Phoenix Lair Distraction and Diversion. It is obtained by using the "Harvest-twigs" option on a ailanthus tree inside the Phoenix Lair. These can then be left-click fletched to make a ailanthus weaving ribbon, granting 5 Fletching experience. When fletching one of the twigs, all types of twigs will be fletched into ribbons at once. Clicking "Craft" on Phoenix's pyre will also automatically fletch all twigs into ribbons.
All twigs and ribbons will disappear if the players leaves the lair.