As a Bonus Action, Grom enters a Rage. While raging, he gains resistance to Bludgeoning, Piercing, and Slashing damage, a bonus to Strength-based damage rolls, and advantage on Strength checks and Strength saving throws. His Rage lasts up to 10 minutes and can be extended through continued combat or a Bonus Action. He has 5 uses of Rage and regains expended uses after a Long Rest, with one use regained after a Short Rest.

When Grom enters a Rage, he chooses one benefit. Bear grants resistance to all damage types except Force, Psychic, and Radiant. Eagle allows him to take the Dash and Disengage actions as one Bonus Action. Wolf gives him Advantage on attack rolls against creatures within his reach.

Grom can use the Weapon Mastery properties of two kinds of Simple or Martial weapons, although he carries no weapons in his modern setting.

Grom has advantage on Dexterity saving throws against effects he can see, such as traps and spells. This feature functions even while he is Blinded or Deafened.

When Grom makes an attack roll using Strength, he can gain Advantage on that roll, but attack rolls against him have Advantage until the start of his next turn. If the attack hits, it deals extra damage equal to his Rage Damage Bonus when he is raging.

Grom gains proficiency in Animal Handling and Perception. While raging, he can use Strength instead of the normal ability for Acrobatics, Intimidation, Perception, Stealth, or Survival checks.

Grom can perform the Beast Sense and Speak with Animals spells as Rituals, using Wisdom as his spellcasting ability for these spells.

Grom improves one or more ability scores or gains a feat, according to his level-based Ability Score Improvements. His final ability scores include these improvements.

Grom can attack twice instead of once whenever he takes the Attack action on his turn.

Grom's Speed increases by 10 feet while he is not wearing Heavy Armor.

After a Long Rest, Grom chooses one benefit. Owl grants Darkvision or extends existing Darkvision by 60 feet. Panther grants a Climb Speed equal to his Speed. Salmon grants a Swim Speed equal to his Speed.

Grom has Advantage on Initiative rolls. If he rolls Initiative and has no uses of Rage remaining, he regains one use.

Immediately after rolling Initiative, Grom can move up to half his Speed as part of that roll. This movement does not provoke Opportunity Attacks.

Grom improves one or more ability scores or gains a feat, according to his level-based Ability Score Improvements. His final ability scores include these improvements.

When Grom uses Reckless Attack and hits with a Strength-based attack, he can forgo Advantage on one attack roll to use one Brutal Strike effect. He deals an extra 1d10 damage and can either force the target to move up to 15 feet, knock it Prone if it is Large or smaller, or reduce its Speed by 15 feet until the start of his next turn.

Grom can perform the Commune with Nature spell as a Ritual, using Wisdom as his spellcasting ability for the spell.

When Grom would be reduced to 0 Hit Points while raging, he can make a DC 10 Constitution saving throw. On a success, he drops to a number of Hit Points equal to twice his Barbarian level instead. The DC increases by 5 after each use and resets to 10 after a Short or Long Rest.

Grom improves one or more ability scores or gains a feat, according to his level-based Ability Score Improvements. His final ability scores include these improvements.

When Grom uses Brutal Strike, he can choose two different Brutal Strike effects instead of one.

Grom can use Strength for any Strength check, even if the check would normally use another ability, and his Strength score is treated as 25 for that check.

Grom retains the respect and practical assistance of military organizations, veterans, and others familiar with his service. He can identify military insignia, understand the customs of soldiers, and secure basic aid or temporary shelter from sympathetic members of military communities when such help is reasonable.