Airoheart

Philo is located south of Telekremorr's Tower in the wood, (Telekremorr's Tower is located west of the first village Llanfair).

To beat him you have to use the slow down power ( the rune of lethargy )

If you don't have it, you can find it here, by following this video guide :
(this video is not mine, credit by : "The Collector's Hubs")