One story from this myth system tells of an enchanter who animates a bunch of trees to fight for him. This mythology also tells of a race of beings that have sharp hearing called the Coraniaids, who are involved in the first of three plagues. In one 
One story from this myth system tells of an enchanter who animates a bunch of trees to fight for him. This mythology also tells of a race of beings that have sharp hearing called the Coraniaids, who are involved in the first of three plagues. In one of their stories, a giant lies down across a river and quote the proverb "He that would be a leader, let him be a bridge." That character's head is later cut off, but continues to speak. Charlotte Guest translated a series of stories from this mythology, and in addition to a story about Bran, Lleu is turned into an eagle when his wife tricks him into standing with one foot on a goat and one on a cauldron in another story. One of their most iconic figures consumes three drops of a magic potion and becomes a legendary bard. For 10 points, name this myth system that includes figures like Rhiannon and Taliesin.
One story from this myth system tells of an enchanter who animates a bunch of trees to fight for him.
{Welsh} mythology [Prompt on “{British}”]