SP

SP is a stat needed for characters to use their skills.

Utilization
In dungeons, hold the A and B buttons until the arrow points to the bar you want to use. There are 4 bars in total, each with their own unique skills.

Gaining SP
SP can be gained by attacking monsters. Certain weapons can even steal SP from monsters, even though monsters do not use SP whatsoever.

SP Regeneration
SP Regeneration (usually shortened to SP Regen in game) is a hidden stat that determines how much SP is recovered over time. By default, all characters have 0.5% SP Regeneration. This stat can only be increased through equipment.