'The time of Clúcath is almost upon us, and you must prepare yourself to do battle; despite your prowess against the warriors of the Trév Gállorg, it will not be enough. You need a greater ally: that of knowledge.
'Many among the Trév Gállorg witnessed the unlawful breaking of the rites of Clúcath in which Nekhtan's father was slain, and they may have some words by which you will avoid a similar fate.
'Osbail, by my ruling-seat, can tell you how Násan met his end and perhaps give you some manner of avoiding a similar fate. Camran, at the centre island of Aughaire, will tell you which of the warriors of the Trév Duvárdain you may be facing. Tasgall, hunter of the hill-beasts south-east of Nád Nathair, may have learned something during his sojourn that will be of aid to you. Speak with these three, and any others who may be able to help, and return to me before long. The Clúcath will not wait forever.'
Crannog's design has been revealed: your Fém is to stand for the Trév Gállorg in Clúcath against the Trév Duvárdain and their Angmarim masters.
Talk to Osbail
Talk to Camran
Talk to Tasgall
Talk to Crannog
Talk to Crannog and travel to Fail-a-Khro
After completing the instance.
Talk to Crannog
If you are having trouble with this quest, go talk to Nekhtan and complete An Understanding first, then try again. Nekhtan will arrive just before the fighting starts, replace Cana, and stand at your side. He is a Defender and will definitely open up a can on them.
An Understanding is ONLY available if you currently have this quest and have not completed it.