12 (natural armor)
22 (5d8)
walk 40 ft., climb 30 ft.
cold; bludgeoning, piercing, slashing
charmed, frightened, grappled, paralyzed, petrified, prone, restrained, stunned
blindsight 10 ft.
1
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.
The young crystal spider swarm can climb difficult surfaces, including upside down in icy or snowy areas, without needing to make an ability check.
The young crystal spider swarm has advantage on Dexterity (Stealth) checks made to hide in icy or snowy terrain.
Melee Weapon Attack: +3 to hit, reach 0 ft., one target in the swarm's space. 10 (4d4) piercing damage, or 5 (2d4) piercing damage if the swarm has half of its hit points or fewer.