Bacar

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

Pack Tactics. The bacar has advantage on an attack roll against a creature if at least one of the bacar's allies is within 5 ft. Of the creature and the ally isn't incapacitated.

Collective Intelligence. A lone bacar is relatively unintelligent, following its orders to the exclusion of other matters. Their base Intelligence is 6. For each additional bacar within 20’, however, the collective Intelligence is raised by one, so that a party of 3 bacars have Average Intelligence of 8, and 6 bacars are Very intelligent (11). At the Very Intelligent level, they begin to use their weapons, including long obsidian knives, macas and slings. When using macas, the bacars use shields, raising their Armor Class +2. When using slings or knives, they do not use shields, but they wield two knives at the same time.At the Highly Intelligent level (13 or better), bacars may collective cast the 5th level spell Insect Plague once per day.

Multiattack. The bacar with Intelligence 6 makes two bite attacks

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 8 (2d4 + 3) piercing damage.

Multiattack. The bacar with Intelligence 11 makes two attacks: two Obsidian Knife attacks or two Maca attacks or two Slings attacks.

Obsidian Knife. Melee or Ranged Weapon Attack: +4 to hit, reach 5 ft. Or range 20/60 ft., one target. Hit: 5 (1d6 + 2) piercing damage.

Maca. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) slashing damage, or 8 (1d10 + 3) slashing damage if used with two hands to make a melee attack.

Sling. Ranged Weapon Attack: +4 to hit, range 30/120 ft., one target. Hit: 4 (1d4 + 2) slashing damage.

Casting Insect Plague (Int 13 or Higher). Eight or more bacars within 20 feet of each other can collective cast the 5th level Insect Plague spell. Each of the bacars must use its action to concentrate as the spells asks. When all eight are concentrated at the same time in the spell, the spell will be cast (DC 11). If one of the eight bacars loses concentration or for some reason their intelligence drops to less than 13, the spell ends. Once the bacars use this ability, it will take a long rest to be able to use this ability again.