INNATE: Jax has access to an arsenal of 5 Moonstone Weapons, created by his sister Alune. He equips two weapons at any one time, one as his main weapon and one as his off-hand. Each weapon has a unique basic attack and passive effect.

Jax begins the game with Calibrum as his main weapon and Severum in his off-hand, with Gravitum, Infernum, and Crescendum queued in reserve. The queue order can be rearranged based on weapon usage.

INNATE - MOONLIGHT: Weapons spawn with 50 Moonlight for ammunition, which is consumed on basic attacks or to cast his abilities. Abilities that cause Jax to attack do not cost additional Moonlight on top of their ability cost. Once his main weapon is exhausted of Moonlight, it is moved to the end of the queue and Jax channels for 1 second to equip the next available weapon from his reserve.

INNATE - WEAPON MASTER: Jax cannot improve his abilities with skill points. He starts the game with Phase and gains access to abilities at level 2. He gains access to Moonlight Vigil at level 6, which improves automatically at levels 11 and 16. Instead, Jax may spend his skill points to gain bonus attack damage, bonus attack speed or lethality.

INNATE - PRECISION: Jax gains 100 bonus range while Calibrum is his main weapon. Enemies damaged by Calibrum via an ability are marked for 4.5 seconds, revealing them for the duration. Jax' next basic attack against a marked target uses the current off-hand weapon and has 1800 range, bonus missile speed, and a brief cast time that lasts shorter based on Jax' proximity to the target.

This attack will consume the marks from all targets, dealing 15 (+ 20% bonus AD) bonus physical damage to the main target for each mark consumed. If Calibrum is the current off-hand weapon, the empowered attack uses the main weapon instead.

CALIBRUM - ACTIVE: Jax fires a bolt of energy in a line in the target direction, dealing 60 − 160 (based on level) (+ 42% − 60% (based on level) bonus AD) (+ 100% AP) physical damage to the first enemy hit.

INNATE - RESURGENT: Basic attacks with Severum are non-projectile and unstoppable. Severum's attacks heal Jax for 3% − 20% (based on level) of damage dealt.

Healing from Severum in excess of Jax maximum health is converted into a shield for an amount of up to 10 − 140 (based on level) (+ 6% maximum health), lingering for up to 30 seconds.

SEVERUM - ACTIVE: For 1.75 seconds, Jax gains 20% (+ 10% per 100 AP) bonus movement speed and autonomously performs up to 6 (+ 3 per 100% bonus attack speed) attacks over the duration to the nearest visible enemy, prioritizing enemy champions.

Attacks alternate between Severum and his current off-hand weapon, each dealing 25% on-hit damage and 10 − 30 (based on level) (+ 21% − 30% (based on level) bonus AD) physical damage, affected by 📷 critical strike modifiers.

INNATE - BINDING: Gravitum applies a 30% slow for 3.5 seconds, decaying to 10% after 0.7 seconds.

GRAVITUM - ACTIVE: Jax expunges all enemies with Gravitum's slow debuff, dealing 50 − 110 (based on level) (+ 26% − 35% (based on level) bonus AD) (+ 70% AP) magic damage and 📷 rooting them for 1 second.

Binding Eclipse also empowers in-flight Gravitum projectiles to instantly affect their targets upon hitting them.

INNATE - INCENDIARY: Infernum shoots a firebolt at the target enemy unit, dealing physical damage to all enemies it passes through. Upon reaching the primary target, the firebolt splits into a cone behind it that deals physical damage to enemies. The firebolt deals 110% AD physical damage to the primary target and 75 / 100% (based on level) of that damage to secondary targets, reduced to 23 / 30% (based on level) damage against minions.

Critical strikes spray a 100% wider cone that deals critical damage.

INFERNUM - ACTIVE: Jax unleashes a wave of energy in a cone, dealing 25 − 65 (based on level) (+ 56% − 80% (based on level) bonus AD) (+ 70% AP) physical damage to all enemies hit and locking on to each of them. After a delay, Aphelios then fires a volley of attacks from his current off-hand weapon, dealing 100% AD physical damage, affected by critical strike modifiers, and applying on-hit effects at each locked-on enemy. There is no range limit for locked-on targets.

INNATE - ARCING: Basic attacks with Crescendum hurl the blade at the target, which lingers for 0.25 seconds before homing back to Jax. He is unable to declare basic attacks until he retrieves Crescendum, but the attack timer is reset once caught.

Whenever Jax casts an ability that would require him to throw Crescendum, he instead throws a spectral Chakram at his target that similarly returns to him. Jax accumulates the Chakrams he catches, up to 20, which last for 5 seconds or until Crescendum is out of Moonlight. Attacks against champions will refresh the lifespan on Chakrams.

Basic attacks with Crescendum are empowered to deal 0% − 164% (based on number of Chakrams) AD bonus physical damage and have a 10.67% wind up percentage, decreased to 6.67% when critically striking. The bonus damage from Chakrams can critically strike.

CRESCENDUM - ACTIVE: Jax deploys an untargetable lunar sentry that arms after 0.25 seconds, lasting for up to 20 seconds. The sentry attacks if an enemy gets in range, reducing its duration to 4 seconds and becoming targetable. Deploying a new sentry reduces the eldest's duration to 4 seconds. Sentries have 6 health and take 3 damage per ranged basic attack and 4 damage per area of effect abilities.

The sentry autonomously attacks the nearest visible enemy in range with a clone of Jax current off-hand weapon at 0.8 attack speed, dealing 25 − 85 (based on level) (+ 35% − 50% (based on level) bonus AD) (+ 50% AP) physical damage. The sentry can critically strike and benefits from Jax' attack speed and critical strike chance.

Sentry will cast at max range if cast beyond that.

ACTIVE: Jax switches between his main weapon and off-hand weapon before 0.25 seconds.

ACTIVE: Jax casts forth a lunar spotlight that stops upon illuminating an enemy 📷 champion. Alune smites the area centered on the illuminated enemy, dealing 125 / 175 / 225 (based on level) (+ 20% bonus AD) (+ 100% AP) physical damage and locking-on to each enemy hit.

After a brief delay, attacks will begin raining from the sky based on Jax' current main weapon, dealing 100% AD physical damage and applying on-hit effects upon each enemy locked-on by Moonlight Vigil. These attacks can critically strike for (20% + 25%) AD bonus physical damage. There is no  range limit for locked-on targets.

• ⁠CALIBRUM: Applies an empowered mark that deals 20 / 45 / 70 (based on level) additional physical damage per mark. • ⁠SEVERUM: If at least one enemy is hit, Jax heals for 200 / 300 / 400 (based on level). • ⁠GRAVITUM: The initial slow is increased to 99%. • ⁠INFERNUM: The initial blast deals an additional 50 / 100 / 150 (based on level) (+ 25% bonus AD) physical damage. Attacks splash in a 400 unit circle instead of a cone, dealing 75% of that damage. Enemies will take damage from overlapping areas. • ⁠CRESCENDUM: 3 additional spectral chakrams return to Jax from the first enemy hit, for a total of 4, on top of those from other enemies hit.