Dallben the Enchanter would consult Hen Wen, the oracular white pig, through the use of the sticks, but only in a matter of greatest urgency. The great enchanter attempted to do so during the rise of the Horned King, but Hen escaped before Dallben could retrieve the rods; and once, successfully, later after Dyrnwyn had been stolen by Arawn.
Instances of Use
The first time Dallben wished to use them within Taran's seeing was during the events of The Book of Three, but the enchanter could not find the rods before Hen Wen escape her enclosure and fled Caer Dallben in a panic. The sole instance Taran saw the Letter Sticks used was at the outset of The High King. At that time, Hen selected a prophecy concerning the stolen sword Dyrnwyn, but the rods exploded before she could complete the final line.