FTP, name this lover of Grainne who has a certain "love spot."
This man is allowed to hide in the tree of the iron-club wielding giant Searbhan, but later fights him to get his magic berries. He fulfills a prophecy by being killed by a boar after water slips through the hands of his ally, and he gained his nickname from a woman who put her hand on his forehead, making him irresistible. FTP, name this lover of Grainne who has a certain "love spot." 
This man is allowed to hide in the tree of the iron-club wielding giant Searbhan, but later fights him to get his magic berries.
Diarmuid or Dermot