Jax takes the Attack Action and makes two weapon attacks, or replaces one attack with a wizard cantrip through War Magic.

Jax uses Action Surge to take one additional Action on his turn, normally for a second Attack Action, Dash, or other non-Magic Action.

Jax uses Second Wind as a Bonus Action to regain 1d10 + 7 Hit Points, then can move up to half his Speed without provoking Opportunity Attacks.

Jax can summon his bonded longsword to his hand as a Bonus Action from the same plane of existence.

As a Bonus Action, Jax can regain 1d10 + 7 Hit Points. He has three uses, regaining one expended use after a Short Rest and all expended uses after a Long Rest.

Jax performs a ritual to create a magical bond with one weapon. He cannot be disarmed of that weapon unless he is incapacitated, and he can summon it to his hand as a Bonus Action from the same plane of existence.

Jax gains the Defense Fighting Style, granting a +1 bonus to Armor Class while wearing armor. He also gains the Dueling Fighting Style, granting a +2 bonus to damage rolls when wielding a melee weapon in one hand and no other weapons.

Jax can use the mastery properties of four chosen weapons: Longsword with Sap, Greatsword with Graze, Javelin with Slow, and Handaxe with Vex. He can change one weapon choice after a Long Rest.

Once per Short or Long Rest, Jax can take one additional Action on his turn, except the Magic Action.

When Jax fails an ability check, he can expend a Second Wind use to roll 1d10 and add the result to the check. If the check still fails, the use is not expended.

Jax gains the Eldritch Knight subclass, combining martial training with wizard spellcasting based on Intelligence.

Jax gains Wizard spellcasting with Intelligence as his spellcasting ability. He knows two wizard cantrips and six wizard spells, including spells from the abjuration and evocation schools. He has three 1st-level spell slots and two 2nd-level spell slots.

Jax gains an Ability Score Improvement feat. The provided final ability scores already include all selected ability score increases and do not receive additional increases here.

Jax can make two attacks when he takes the Attack Action.

Immediately after using Second Wind, Jax can move up to half his Speed without provoking Opportunity Attacks.

Jax gains another Ability Score Improvement feat. The provided final ability scores already include all selected ability score increases and do not receive additional increases here.

When Jax takes the Attack Action, he can replace one of his attacks with a wizard cantrip that has a casting time of one Action.

Military Rank. Jax retains the respect and authority associated with his former service in the Atrix Isle Civil Defense Corps. Soldiers loyal to his former organization recognize his rank and may provide access to modest support, shelter, information, or logistical assistance when doing so does not place them in unreasonable danger.