Iseldir: You must be wary, Emrys... the legends tell a tale that only the Druids know.
Merlin: What do they say?
Iseldir: Ashkanar was a wise man... he knew one day men would come seeking to disturb his rest. The Triskellion is not just a key. It is also a trap.
Merlin: What do you mean? What kind of trap?
Iseldir: I do not know, but the legends are very clear. You must beware, Emrys. (Merlin turns to leave) Emrys! There is one other thing the legends say. Only when the way ahead seems impossible will you have found it.