Zelot. while the giant Goose is raging, if they drop to 0 hit points, they don't die. they still roll death saves and only die when they stop their rage. the giant Goose has advantage against enemies of the God-emporer goose hydra, and is immune to the effects of the calm emotions spell.

Beak. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 9 (2d6 + 3) piercing damage.

Rage (3/day). the giant goose enters a rage. the rage lasts for 1 minute, while raging, the goose gets +10 to attack and damage rolls, advantage on strength saves, and gains resistance to bludgeoning, slashing, and piercing damage.