Board Thread:Questions and Answers/@comment-20426317-20131002215808/@comment-8276741-20131002230116

To increase the skill level over the 'capped' level you can do three things.

Fuse the daemon with its magatama (Kotetsu [Focused] + Kotetsu [Focused] magatama)

Fuse two identical daemons with each other (maxed = 100% skill up)

Fuse the daemon with a daemon/magatama with the same skill name AND skill effect.