When Jayce swaps weapons he gains movement speed for a short duration.
Hammer Stance: Leaps to an enemy dealing physical damage and slowing enemies.
Cannon Stance: Fires an orb of electricity that detonates upon hitting an enemy (or reaching the end of its path) dealing physical damage to all enemies hit.
Hammer Stance: Passive: Restores Mana per strike. Active: Creates a field of lightning damaging nearby enemies for several seconds.
Cannon Stance: Gains a burst of energy, increasing Attack Speed to maximum for several attacks.
Hammer Stance: Deals magic damage to an enemy and knocks them back a short distance.
Cannon Stance: Deploys an Acceleration Gate increasing the Movement Speed of all allied champions who pass through it. If Shock Blast is fired through the gate the missile speed, range, and damage will increase.
Hammer Stance: Transforms the Mercury Hammer into the Mercury Cannon gaining new abilities and increased range. The first attack in this form reduces the target's Armor and Magic Resist.
Cannon Stance: Transforms the Mercury Cannon into the Mercury Hammer gaining new abilities and increasing Armor and Magic Resist. The first attack in this form deals additional magic damage.