Rollo the Minstrel lives in The Town of Grove and sings songs to people for a price which gain them enough Fame to attain a new level of Renown.
Rollo claims to have played before kings. As such, he can play you a song to increase your Renown in exchange for some gold. Each time he plays you a song, your Renown advances up a rank but his price becomes more expensive. Every time your Renown level increases, you get four points to spend on your skills; this can be a good alternative to leveling up normally with XP if you don't feel like grinding for XP and you have enough gold to pay Rollo. Sometimes, though, reaching a new Renown level can be achieved by earning Fame via completing a certain number of quests or defeating high-level bosses.
Rollo can be found in the north-western part of town, standing next to Dreya the Healer.