Battlemane Lynx

Warrior's Vigil: (No training required) If its chosen person falls unconscious, the Battlemane Lynx stands unyielding and watchful over them. Any creature that comes within 5 feet of the unconscious trainer for the first time on a turn must make a DC 12 Wisdom saving throw or become frightened of the lynx until the end of its next turn.

Night Guardian: While the trainer rests or sleeps, the Battlemane Lynx remains alert. Any attempt to surprise the barbarian or approach stealthily within 30 feet of the resting place is immediately made known to the lynx, who then alerts its companion.

(Expert) Ferocious Predator: Once per day, as a bonus action, the lynx can emit a fearsome roar reminiscent of ancient battle cries. The bonded trainer can reroll a 1 or 2 on damage dice when using a melee weapon.

(Special Expert) Echoes of Valor: When the bonded trainer falls unconscious, the Battlemane Lynx, as a reaction, can emit a heart-rending yowl echoing the spirit of a fallen warrior. This grants the trainer an immediate death saving throw, with a success counting as two successes.

Bite: Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 2 piercing damage.
Claw: Melee Weapon Attack: +3 to hit, reach 5 ft. one target, Hit: 1d4 piercing damage.

Distracting Claw: Once per short rest, the lynx can swipe with precision at an enemy's eyes as an action, forcing it to make a DC 10 Dexterity saving throw or become blinded until the end of its next turn.