Classes are used to further describe a skill beyond its description. Generally Skill Classes are only important in determining whether one skill will affect another in the course of a game.
The Execution Class is always written first in the skill's class list. The Execution class describes in which way the skill is executed. Some effects can target one or more of these Execution Classes. For example, a skill can make you invulnerable to melee skills, or a skill can stun a character's mental skills.
Offensive, short distance skills that generally deal physical damage.
Offensive, long distance skills that generally deal physical damage.
Skills that involve mental abilities.
Skills that involve counters, defenses and special abilities.
Skills that are already active when a battle starts and cannot be performed during battle.
The Persistence Class is always written second in a skill's class list. The Persistence class describes the connection the skill's effects have with the performer of the skill.
The effects of Instant skills have no connection with the skill's performer after entering the game.
The effects of Aura skills require the skill's performer to be alive. If the skill's performer dies, the Aura skill ends.
The effects of Channeling skills require the skill's performer to maintain contact. If contact is broken, the Channeling skill ends. Contact is broken when the performer is stunned, or when the skill's target becomes invulnerable to the performer.
Extension Classes are optional, and describe the special qualities of a skill. Unlike other classes, a skill can have multiple Extension classes.
Uncounterable skills are not affected by counters.
Bypass skills are not affected by invulnerability on its target.
Stack skills can be stacked multiple times on the same target. This means that Stack skills can be performed on targets already affected by that skill.
Renew skills can renew their effects on a target. This means that Renew skills can be performed on targets already affected by that skill, but instead of stacking, the old effects are replaced by the new effects.
Invisible skills can not be seen by your opponent. Not when you perform them, nor while they are active.
Toggle skills can be toggled on and off. The first time you cast a Toggle skill, its effects become active in the game. If you perform the skill again while it is active, you will end the skill.
Unique skills cannot be performed while they are active.
The altered tag in the Class List indicates that the skill has a different set of classes while the skill is altered.