Amphibious. The egg hunter can breathe air and water.

False Appearance. If the egg hunter is motionless at the start of combat, it has advantage on its initiative roll. Moreover, if a creature hasn't observed the egg hunter move or act, that creature must succeed on a DC 18 Intelligence (Investigation) check to discern that the egg hunter is animate. Dragons have disadvantage on this check.

Multiattack. The egg hunter makes two Barbed Proboscis attacks, and it can use Torpor Spores if it's available.

Barbed Proboscis. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit:8 (1d6 + 5) piercing damage plus 9 (2d8) necrotic damage, and the egg hunter regains hit points equal to the necrotic damage dealt.

Torpor Spores (Recharge 5–6). The egg hunter releases a billow of sparkling blue spores. Each creature in a 30-foot-radius sphere centered on the egg hunter must succeed on a DC 14 Constitution saving throw or be poisoned for 1 minute. While poisoned in this way, the creature can take either an action or a bonus action on its turn but not both, and it can't take reactions. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to this egg hunter's Torpor Spores for the next 24 hours.

Rapid Adaptation. When the egg hunter takes damage, it gives itself resistance to that damage.