Auru

Auru is one of the members of Telma's group. You first meet up with him in southwestern Lake Hylia at the top of a tall lookout tower. He will tell you that he believes the evil currently plaguing Hyrule is related to the desert- specifically, the Arbiter's Grounds, a prison formerly used to house 'the worst criminals this land (Hyrule) has ever known'... also, as it happens, the resting place of a cursed mirror used to (supposedly) send criminals sentenced to death directly to the underworld. Whilst he tells you that the road leading to the desert is impassable, he helps you get there through use of Fyer's cannon- the memo he gives you instructs Fyer to send you to the desert for free, a request he cannot refuse due to Auru's saving Fyer's life a long time ago. It is in such a way that Link gains access to the Gerudo Desert- and, eventually, the Mirror of Twilight. After completion of the Arbiter's Grounds, Auru can be met at any time in Telma's Bar.