Lysas

Lysas was the satyr who spread the word about Pan's death.

History
Lysas was the chosen one of Pan, being tasked by the god himself to spread the word that "The great god Pan has died." Even though he refused to believe this, he spread the word to the world in Ephesos.

The Battle of the Labyrinth
Lysas is mentioned in the Battle of the Labyrinth when the quest for Daedalus find Pan in Pan's cave. The questers are told about how Pan tried to tell the world that he is dead and wanted to fade away but the satyrs refused to believe this. He then tells Grover to do the same as Lysas.

Personality
Lysas is portrayed by Pan to be like Grover, who is brave, good and true.