Swarm. Archival Swarms can occupy another creature's space, and can move through any opening large enough for a piece of paper; the swarm can't regain hit points or gain temporary hit points. Swarm Mentality. Archival Swarms have advantage on melee attacks made against a target whose space they occupy. Magic Resistance. Archival Swarms have advantage on saving throws against spells and other magical effects.
Papercut. Melee Weapon Attack: 1d20+2 to hit; The Swarm targets one creature it can see within 5 feet and moves into their space. On a hit, the target takes 3d6 slashing damage and their speed is reduced to 0 until the start of the Swarm's next turn. Hypnotic Pattern. Radial Spell: Acting in unison, the Swarm creates a twisting pattern in the air. Each creature within a 10 foot radius must make a DC 15 Wisdom Saving Throw. On a failure the targets become charmed until the start of the Swarm's next turn. Charmed targets cannot act against the swarm. Silent Secret. Ranged Spell Attack: 1d20+3 to hit; The Swarm targets one creature it can see within 10 feet that has a brain. The target takes 1d8+3 psychic damage and must succeed on a DC 15 Wisdom Saving Throw. On a failure, the target is unable to speak or cast spells that require verbal components until the start of the Swarm's next turn. Devour Intellect. Ranged Spell Attack: 1d20+3 to hit; The Swarm targets one creature it can see within 10 feet that has a brain. The target must succeed on a DC 15 Intelligence Saving Throw take 2d10+3 psychic damage. On a failure 3d6 . If the total equals or exceeds the target’s Intelligence score, that score is reduced to 0 and the target is stunned until it regains at least one point.