Colony Swarm. The swarm can occupy another creature's space and vice versa, and the swarm can move through any opening large enough for a Tiny insect. The swarm can't regain hit points or gain temporary hit points from outside effects, cannot be targeted by an effect that specifies a single creature, creatures have disadvantage on opportunity attacks made against it, and can it can make up to 3 attacks of opportunity in a round.
Bite. Melee Weapon Attack: +5 to hit, reach 10 ft., one target Hit: (6d4) piercing damage.
Magic Gnawing. The colony can cast dispel magic on or break the concentration of any target within 10 ft. of it on solid ground.
Description
The nests of the Abjuring Termites are indestructible.
It's not hyperbole: the apparently fragile termites' mounts can withstand anything from a kick to the assault of a hungry pangolin, from a hammer wielded by an iron golem to a fireball.
For centuries scholars thought the insects added some substance to the mud to create that sort of unbreakable porcelain, but that didn't explain why abandoned nests crumble like dirt.
The solution was the studies about spellcasting vermins inaugurated by the Great Shinar and his assistant Gwinnifar. Once one realizes the termites are casting a continuous protective spell, then everything makes sense.
The complex and unpractical shape of the mounts is, in fact, analogous to a magical knot: in place of weaving hands and chanting words as the humanoids, the insects fold mana by traveling in specifically designed tunnels.
Alongside the "Queen", the "Soldiers" and "Workers", there is a caste of termite "Wizard" tasked to walk in a never-ending procession inside the convoluted passages of the nest. As the population grows and the nest gets bigger, a longer path is built onto the smaller ones, creating a self-replicating shape.
The termites' spell creates a "coating of inertia" around the structure, making it impervious to changes.
A low-level version of the abjuring spell is always present, since it helps keep the nest's structure solid and, through rhythmic strengthening and weakening, allows for ventilation through tiny apertures, almost like breathing through pores.
When the colony is under attack, the wizard termite activates a high-level spell, frantically running up and down the mystic path, making the nest indestructible.
This is, in part, still a theory
Inspired by Codex Inversus
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