This is my first attempt to get a review of a monster stat block. If I'm doing something wrong, let me know.
My goal for this creature is to be a trash mob, but with enough resistance/immunity to not get crowd-controlled too easily so the party focuses on tactics.
The core is based on the Palimpsest (a spell scroll that eats people), with some construct condition immunities that make sense. Some features from Rug of Smothering, and generic golems. I'm not 100% happy with all the features, and will likely tweak stuff before my party encounters this. I know Challenge Ratings in 5e are hardly accurate, but I'm aiming for no more than ~5-6 tops.
Medium construct, neutral
Armor Class: 12
Hit Points: 18 (4d6 + 4)
Speed: 5 ft., fly 15 ft.
Str Dex Con Int Wis Cha 2 (-4) 14 (+2) 12 (+1 4 (-3) 16 (+3) 10 (+0)
Damage Immunities: fire, poison, necrotic, piercing, slashing, and bludgeoning damage from nonmagical weapons
Condition Immunities: charmed, exhausted, poisoned, frightened, blinded, deafened, paralyzed, petrified
Senses: blindsight 60 ft., passive Perception 13
Languages: one language their creator knows
Immutable Form. The golem is immune to any spell or effect that would alter its form.
Magic Resistance. The golem has advantage on saving throws against spells and other magical effects.
Magic Weapons. The golem's weapon attacks are magical.
Antimagic Susceptibility. The golem is incapacitated while in the area of an antimagic field. If targeted by dispel magic, the golem must succeed on a Constitution saving throw against the caster's spell save DC or fall unconscious for 1 minute.
Damage Transfer. While it is grappling a creature, the golem takes only half the damage dealt to it, and the creature grappled by the golem takes the other half.
False Appearance. While the golem remains motionless, it is indistinguishable from normal paper.
Multiattack. The golem makes two cut attacks.
Cut. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 2) slashing damage.
Smother. Melee Weapon Attack: +4 to hit, reach 5 ft., one Medium or smaller creature. Hit: The creature is grappled (escape DC 13). Until this grapple ends, the target is restrained, and the golem can't smother another target. In addition, at the start of each of the target's turns, the target takes 10 (2d6 - 4) bludgeoning damage.