Encounter 3 - lvl 5 to 10

2x Mimic Medium monstrosity (shapechanger) , neutral
Armor Class 12 (Natural Armor) Hit Points (9d8 + 18) Speed 15 ft.
STR 17 (+3) DEX 12 (+1) CON 15 (+2) INT 5 (-3) WIS 13 (+1) CHA 8 (-1)
Skills Stealth +5 Damage Immunities Acid Condition Immunities Prone Senses Darkvision 60 ft., Passive Perception 11 Languages -- Challenge 2 (450 XP) Proficiency Bonus +2
Shapechanger. The mimic can use its action to polymorph into an object or back into its true, amorphous form. Its statistics are the same in each form. Any equipment it is wearing or carrying isn't transformed. It reverts to its true form if it dies.
Adhesive (Object Form Only). The mimic adheres to anything that touches it. A Huge or smaller creature adhered to the mimic is also grappled by it (escape DC 13). Ability checks made to escape this grapple have disadvantage.
False Appearance (Object Form Only). While the mimic remains motionless, it is indistinguishable from an ordinary object.
Grappler. The mimic has advantage on attack rolls against any creature grappled by it.
Actions Pseudopod. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: (1d8 + 3) bludgeoning damage. If the mimic is in object form, the target is subjected to its Adhesive trait.
Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: (1d8 + 3) piercing damage plus (1d8) acid damage
3x Rug of Smothering Large construct , unaligned
Armor Class 12 Hit Points (6d10) Speed 10 ft.
STR 17 (+3) DEX 14 (+2) CON 10 (+0) INT 1 (-5) WIS 3 (-4) CHA 1 (-5)
Damage Immunities Poison, Psychic Condition Immunities Blinded, Charmed, Deafened, Frightened, Paralyzed, Petrified, Poisoned Senses Blindsight 60 ft. (blind beyond this radius), Passive Perception 6 Languages -- Challenge 2 (450 XP) Proficiency Bonus +2
Antimagic Susceptibility. The rug is incapacitated while in the area of an antimagic field. If targeted by dispel magic, the rug 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 rug takes only half the damage dealt to it, and the creature grappled by the rug takes the other half.
False Appearance. While the rug remains motionless, it is indistinguishable from a normal rug.
Actions Smother. Melee Weapon Attack: +5 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, blinded, and at risk of suffocating, and the rug can't smother another target. In addition, at the start of each of the target's turns, the target takes (2d6 + 3) bludgeoning damage.