Originally Posted by kabosu

Can someone tell me what the path to learning ability stuff does?

It's the resource used to increase the level of abilities like Taunt or Recovery Boost for a Knight. Attack Up has six levels with each level past the first increasing the attack boost by 1% (10-15% at level 1-6). Taunt has 25 levels with each level past the first increasing the damage reduction by 0.5% (4-16% at level 1-25). Speed Up/Down only have one level so +/-20 speed is the most you'll get out of them.

I don't have any of the other abilities unlocked yet (only enough life crystals to unlock two of Recovery Boost, Crit Boost and Guard Boost; not really feeling like spending 7500 sun medals on Weakness Damage Boost right now) but I figure they can be leveled up as well.