Primary and secondary spells.
Spells or "attacks" have two modes.
Primary:
Used with Mouse1 with the cooldown of the weapon equipped.
Deals damage of weapon damage + damage modifier based on strength or intellect.
Cost no or very little mana.
Secondary:
Used with Mouse2 with the cooldown of the spell.
Several spells will be available by the different classes. Spells to be purchased or found in the dungeons.
Cost more mana and with different cooldowns based on different spells.