Board Thread:Questions and Answers/@comment-19203513-20130914101051/@comment-26228073-20130925215624

hmm... I think you may have already solved your problem, but I think there's an easier way to explain this, maybe?

So, without any magatamas or daemons that have the same skill, When any 3* is maxed out, it's skill level is always 11 (11 isn't really a max, but a limit). So you would need 9 of sensu's magatamas to max out her skill to level 20.

Level 20 is the max for all daemons. All daemon's levels can be raised if a daemon with the same skill is fused into that daemon. It will be 100% chance +1 increase if the daemon is maxed. Magatamas is already maxed, so that would be good. But if you wanted to like raise Nyx's Skill level if you had duplicate Nyx's, then you would max out the nyx first before you use it as a feeder.

And like what Ryou said, it doesn't matter when you fuse the magas/daemons into that daemon, even if it's maxed. Skill level and Regular Level don't really intertwine together, except for the every 5 levels, the skill level will raise.