This particular mimic species has a rather unique origin. As polyps the first batch was caught in a giant spider's web soon after being spawned. Rather than being devoured by the arachnid, they turned into sticky strands amid the webwork. Not long after that, a group of adventurers slew said spider and moved on. The mimics had something to subsist on and kept their disguise to keep more bugs. When the spider's eggs hatched, instead of eating the young, the mimics were amused by the creatures and they protected them until they were large enough until to ride off to better climes. Eventually, these mimics took the shape of netting of all sorts: ship rigging, cargo nets, and so on as they were less conspicuous than spider webs. They still remain friends with things eight-legged.

Netting Mimic

Medium Monstrosity (shapechanger), neutral

Armor Class 13 (natural armor)

52 (8d8 + 16)

Speed 15 ft

Climb 15 ft

Str 16 Dex 14 Con 15 Int 5 Wis 15 Cha 8

Skills Stealth +6

Damage Immunities acid, poison

Condition Immunities prone, poisoned

Sensesdarkvision 60 ft, passive Perception 12

Languages -

Challenge 4 (1,100 XP)

Shapechanger.

The mimic can use its action to polymorph into a cargo net, ship's rigging, etc, 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.

Arachnophilia.

Spiders and link creatures with an Intelligence of 3 or less treat the mimic as a friendly creature. If the spider is within 5ft of the mimic and the mimic is not Incapacitated, the spider gains Advantage on its attacks. Friendly spiders are immune to the mimic's Adhesive ability.

Variations of this mimic apply this ability to crabs instead.

False Appearance (Object Form Only)

While the mimic remains motionless, it is indistinguishable from an ordinary a cargo net, ship's rigging, etc, or.

Grappler.

The mimic has advantage on attack rolls against any creature grappled by it.

Gullet (Object Form Only).

The mimic can innately cast Web (spell save DC 12), requiring no material components. Its innate spellcasting ability is Wisdom.

Innate Spellcasting (2/Day).

A creature attuned to the mimic and wearing it in object form gains resistance from cold, the Survival skill if they do not have it, and advantage on Strength (Athletics) checks when climbing if the mimic is not incapacitated.

Spider Climb.

The mimic can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Actions

Multiattack.

The mimic makes two pseudopod attacks.

Pseudopod.

Melee Weapon Attack: +5 to hit, reach 10 ft., one target. Hit: 7 (1d8 + 3) bludgeoning damage. If the mimic is in object form, the target is subjected to its Adhesive trait.

Bite.

Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 10 (2d6 + 3) piercing damage plus 4 (1d8) acid damage. A creature must succeed on a DC 12 Strength save or the mimic swallows an object it is brandishing if it is medium size or smaller which is then subject to the Gullet ability.

Reactions

Flexible (Object Form Only).

When the mimic is hit with an attack from an attacker it can see, the mimic may reduce that damage by half.