Cad Goddeau B (level 20)
DISCLAIMER: Your Steps and Tasks may be different
Characters that were created after Patch Version 1.79 do not receive this Epic quest.
Go to Tir Uphorst in the Cliffs of Moher and run due east up the hill from the Guard Tower where u will find lots of siabras and a hut and some structures. You may need friends, if you are low level, to clear the siabra camp. Siabras are social and call for help when attacked. Or if you are high level and they con gray to you, they wont even aggro.
Look for the enclosed pointy-roof house and you will find the Druid Harkin and a siabra distorter sometimes spawns in the same room. Right clicking on Druid Harkin gives us nothing useful so /say [the old hermit has awakened] to him. Several things will happen. The Druid will give you an item (Transfixing Robes, looks very similar to a Siabra robe but a lighter hue), a parched scroll (to be delivered to a merchant), then runs out thanking you for freeing him.
Run back west to Tir Uphorst and look for Callough (the weapon merchant under the mushroom). Give him the scroll Harkin gave you and follow the conversation. He will ask you to seek Cathbad in Howth to obtain Bas' Jewel.
This you must do at level 25
Official hint (from Camelot Herald):