Creaker

Sleeper. Outside of combat, the creaker remains in a sleeplike motionless state. If anything physically disturbs the creaker or if any loud non-natural noise is made within 100 ft. of the creaker, it will slowly rise from its sleep over the course of 30 seconds.

Undead Fortitude. If damage reduces creaker to 0 hit points, it must make a Constitution saving throw with a DC of 5+the damage taken, unless the damage is radiant or from a critical hit. On a success, the creaker drops to 1 hit point instead.

Sunlight Sensitivity. While in sunlight, the creaker has disadvantage on attack rolls, as well as on Wisdom (Perception) checks.

Eyeless. The creaker is blind and will automatically fail any Wisdom (Perception) checks relying on sight.

Keen Listener. The creaker has advantage on Wisdom (Perception) checks relying on hearing.

Multiattack. The creaker makes two claw attacks.

Claw. Melee Weapon Attack: +4 to hit, reach 5 ft., 1 target. Hit: 14 (2d8 + 5) slashing damage.

Rusted Fangs. Melee Weapon Attack: +4 to hit, reach 5 ft., 1 target. Hit: 23 (3d10 + 7) piercing damage and 8 (1d8 + 3) necrotic damage. The target must succeed on a DC 18 Constitution saving throw or become infected with Rust Blight. Over the course of three days, Rust Blight will slowly cause a new creaker to grow within the infected host's body, eventually killing them and turning them into a creaker. Rust Blight can be cured by use of the greater restoration spell.

Scream of Agony. The creaker lets loose a piercing scream that can be heard from 200 ft. away. Any creature that can hear the scream must succeed on a DC 18 Wisdom saving throw or become frightened and paralyzed for one turn. If any sleeping creakers are within 60 ft., they instantly wake up on a DC 16 Wisdom (Perception) check.