Surge

In Game Description- "Provides a surge of awesome attack power."

Surge is an auto-ability learnt at the Mojo-Dojo & is upgrade-able there as well.

It grants equipper a surge of an attack boost. This is very useful for taking out enemies.

It is quite opposite of Harden because it adds attack instead of defense.

While attacking your attack goes up quite a bit, since this is an auto ability it activates without you pressing anything, and instead when the conditions are met, unlike Action-Abilities,

which you must press a button to activate. Also since this is an auto-ability, you may equip 3 others along,

that will activate automatically, so since there are many auto-abilities, you may choose the ones that are most

valuable for your characters. Also, rings/weapons may increase the LV of the abilities such as Surge.

Apparently from sources you get +48 ATK if it is on LVL.9.