Blitzkrieg Beetle Hive

Unimpeded trudge. This creature can move through any space as long as it is 1 by 1 inches or more. This creature can also occupy the same space as another creature.

Hectic swarming. While this creature occupies the same space as an enemy creature, the enemy creature's base movement speed becomes 5 feet, and it can no longer make opportunity attacks as long as it occupies the same space as the Blitzkrieg Beetle Hive. Only one Blitzkrieg Beetle Hive can occupy the same space as another creature at a time.

Incendiary aura. Whenever this creature uses an attack whilst they are occupying the same space as the target, its attacks do an extra 1d4 fire damage to the target.

Puncturing salvo. Melee Weapon Attack: +4 to hit, reach 5 ft., 1 target. Hit: 6 (1d4 + 4) peircing damage. 

Focus blast(basic). Ranged Weapon Attack: +4 to hit, range 20/50 ft., 1 target. Hit: 7 (1d4 + 4) fire damage.

Focus blast(concentration). Ranged Weapon Attack: +8 to hit, range 10/100 ft., 1 target. Hit: 18 (3d8 + 4) fire damage. If this is the first time this action is being used by this creature, it does nothing. The creature then goes into concentration to maintain this effect. If this is the second time this creature is using this action, this creature must succeed on a DC 12 constitution saving throw. On a failed save, the attack damage is halved, rounding down, and this creature takes 2d6 force damage.