Board Thread:Questions and Answers/@comment-20426317-20131002215808/@comment-8276741-20131002235627

A lv 1 has very little chance, I'd say 100/daemon's max level which makes it 2% for 3*, 1,6% for 4* and 1,4% for 5*. This is just a speculation as no one knows the exact percentage. The more their levels the better chance they have to increase the skill. But it'd be best to max them out before fusing them together for a guaranteed skill up, instead of wasting them on nothing.