Feathery Demise? When the goose is reduced to 0 hit points by any means, it disappears in a cloud of white feathers accompanied by a pained honk. When the feathers settle, there is no trace of the avian menace's corpse. For the purpose of any spells, abilities or items that facilitate or require the use of a corpse to function, the goose's corpse is not a valid target as it does not exist. Furthermore, the death of the goose cannot be confirmed by any magical or non-magical means.

Bite. Melee Weapon Attack: +2 to hit, reach 5 ft., one creature. Hit: 2 (1d2) [piercing] damage. 

Obnoxious Honk (Recharge 5–6). The goose lets out a particularly obnoxious honk, each creature concentrating on a spell within 5 ft. of the goose must make a DC 10 concentration check.

Unnerving Hiss (Recharge 5–6). The goose spreads it's wings and emits a sharp, unnerving hiss - unveiling it's unholy tongue teeth with malice in it's eyes. Every creature within a 10 ft. cone must succeed on a DC 10 wisdom saving throw or be frightened for twelve seconds.

Flurry of Feathers and Feet (Recharge 5–6). The goose moves an extra 5 ft. and makes a Bite attack. On a successful hit, the target halves it's movement speed and if it is concentrating on a spell must succeed on a DC 10 concentration check.