User blog:Broman178/Merlin's ability to sense magical objects.

Hi everyone, there is something which really bugs me about Merlin and this is because he has the ability to sense magical objects like the Mage Stone (To Kill the King), Rowan Staff (The Tears of Uther Pendragon: Part 2), Phoenix Eye (The Eye of the Phoenix) and The Cup of Life (The Coming of Arthur: Part 2). His ability to sense objects with magic normally happens if the kingdom of Camelot or anyone close to him are in danger (like Arthur), and if he needs to find any of those objects.

However, in two episodes from Series 4: The Wicked Day when he couldn't even sense Morgana's enchanted pendant around Uther's neck, and Lancelot du Lac when he also couldn't sense Gwen's enchanted bracelet on her wrist, Merlin seems to lack this ability which was why he couldn't prevent Uther's death or Gwen's second affair with Lancelot. I didn't enjoy either of those two episodes (The Wicked Day because there were many plotholes and several aspects of Uther's character were left out e.g. his anguish over Morgana's betrayal) (Lancelot du Lac because it destroyed the character of Lancelot and mocked the Arthur/Gwen/Lancelot love triangle by making Gwen and Lancelot enchanted) but the fact that his special ability for magical objects was absent in those two episodes is a huge plothole in the show.

What do you think?, are there some enchanted objects which Merlin can't sense?, or did the producers while making The Wicked Day and Lancelot du Lac forget that Merlin could sense magical objects, especially powerful ones? and feel free to give other examples of this matter from the show.