In Eiyuden Chronicle: Hundred Heroes, Nowa finds Gieran conducting research in the middle of the forest. Gieran has spent a lot of time alone with his studies and is excited to join the group.
In the middle of The Greatwood East you'll see a piece of the trail that spirals in toward the river in the middle and ends on an island inside the river.
Gieran has a campfire here and tells you he is looking for a Rune of Conversion. You will obtain this Rune as part of The Proving Grounds and return to him with it. After giving it to him, you can recruit Gieran to the party.
Role: Battle
Range: Long
Damage Type: Earth
Defense Action: Defense - Assume a defensive stance to take half damage this turn
Rune Slots: 4
Active Skills: Earth Heal - Cure any condition on 1 ally. Cost: 25 MP.
Rock Thrust - Deal moderate earth damage to an enemy and reduce armor. Cost: 35 MP.
Earth Shaker - Deal moderate earth damage to all foes and possibly stun them. Cost: 55 MP.
Mage Combo (w/ Mellore and Maureus) - Deal all enemies light damage. Cost: 3 SP.
Mage Combo (w/ Maureus and Momo) - Deal all enemies moderate light damage. Cost: 3 SP.
Complete Mage Combo (w/ Maureus, Mellore, and Momo) - Deal all enemies massive aerial damage. Cost: 4 SP.