Attack

Often abbreviated as ATK, attack determines max damage on a successful hit, essentially calculated by weapon's damage * derivative based on attack. ATK isn't relevant to your hit chance.

Note: Over numerous hit-damage trials, the following was determined. For a Rogue, the percent increase in damage due to 1 ATK seems to be about ~0.069%. For a Warrior, the percent/ATK ratio is about ~0.075. Appears that some classes could benefit more from spells like Spell: Somatic Bond than others.