Traits

Spider Climb. The spider can climb difficult surfaces, including along ceilings, without needing to make an ability check.

Web Walker. The spider ignores movement restrictions caused by webs, and the spider knows the location of any other creature in contact with the same web.

Actions

Bite. Melee Attack Roll: Hit: +4, reach 5 ft. 1 Piercing damage plus 2 (1d4) Poison damage. Swarm of Bats Large Swarm of Tiny Beasts, Unaligned AC 12 Initiative +2 (12) HP 11 (2d10) Speed 5 ft., Fly 30 ft. 5 −3 −3 15 +2 +2 10 +0 +0 S D C 2 −4 −4 12 +1 +1 4 −3 −3 I W C Resistances Bludgeoning, Piercing, Slashing Immunities Charmed, Frightened, Grappled, Paralyzed, Petrified, Prone, Restrained, Stunned Senses Blindsight 60 ft.; Passive Perception 11 Languages None CR 1/4 (XP 50; PB +2)

Traits

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 bat. The swarm can’t regain Hit Points or gain Temporary Hit Points.

Actions

Bites. Melee Attack Roll: Hit: +4, reach 5 ft. 5 (2d4) Piercing damage, or 2 (1d4) Piercing damage if the swarm is Bloodied. Swarm of Insects Medium Swarm of Tiny Beasts, Unaligned AC 11 Initiative +1 (11) HP 19 (3d8 + 6) Speed 20 ft., Climb or Fly 20 ft. (GM’s choice)

Resistances Bludgeoning, Piercing, Slashing Immunities Charmed, Frightened, Grappled, Paralyzed, Petrified, Prone, Restrained, Stunned Senses Blindsight 30 ft.; Passive Perception 8 Languages None CR 1/2 (XP 100; PB +2)

Traits

Spider Climb. If the swarm has a Climb Speed, the swarm can climb difficult surfaces, including along ceilings, without needing to make an ability check.

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.

Actions

Bites. Melee Attack Roll: Hit: +3, reach 5 ft. 6 (2d4 + 1) Poison damage, or 3 (1d4 + 1) Poison damage if the swarm is Bloodied. Swarm of Piranhas Medium Swarm of Tiny Beasts, Unaligned AC 13 Initiative +3 (13) HP 28 (8d8 − 8) Speed 5 ft., Swim 40 ft. 13 +1 +1 16 +3 +3 9 −1 −1 S D C 1 −5 −5 7 −2 −2 2 −4 −4 I W C Resistances Bludgeoning, Piercing, Slashing Immunities Charmed, Frightened, Grappled, Paralyzed, Petrified, Prone, Restrained, Stunned Senses Darkvision 60 ft.; Passive Perception 8 Languages None CR 1 (XP 200; PB +2)

Traits

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 piranha. The swarm can’t regain Hit Points or gain Temporary Hit Points.

Water Breathing. The swarm can breathe only underwater.

Actions

Bites. Melee Attack Roll: +5 (with Advantage if the Hit: target doesn’t have all its Hit Points), reach 5 ft. 8 (2d4 + 3) Piercing damage, or 5 (1d4 + 3) Piercing damage if the swarm is Bloodied. Swarm of Rats Medium Swarm of Tiny Beasts, Unaligned AC 10 Initiative +0 (10) HP 14 (4d8 − 4) Speed 30 ft., Climb 30 ft. 9 −1 −1 11 +0 +2 9 −1 −1 S D C 2 −4 −4 10 +0 +0 3 −4 −4 I W C Resistances Bludgeoning, Piercing, Slashing Immunities Charmed, Frightened, Grappled, Paralyzed, Petrified, Prone, Restrained, Stunned Senses Darkvision 30 ft.; Passive Perception 10 Languages None CR 1/4 (XP 50; PB +2)

Traits

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 rat. The swarm can’t regain Hit Points or gain Temporary Hit Points.

Actions

Bites. Melee Attack Roll: Hit: +2, reach 5 ft. 5 (2d4) Piercing damage, or 2 (1d4) Piercing damage if the swarm is Bloodied. Swarm of Ravens Medium Swarm of Tiny Beasts, Unaligned AC 12 Initiative +2 (12) HP 11 (2d8 + 2) Speed 10 ft., Fly 50 ft. 6 −2 −2 14 +2 +2 12 +1 +1 S D C 5 −3 −3 12 +1 +1 6 −2 −2 I W C Skills Perception +5 Resistances Bludgeoning, Piercing, Slashing Immunities Charmed, Frightened, Grappled, Paralyzed, Petrified, Prone, Restrained, Stunned Senses Passive Perception 15 Languages None CR 1/4 (XP 50; PB +2)

Traits

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 raven. The swarm can’t regain Hit Points or gain Temporary Hit Points.

Actions

Beaks. Melee Attack Roll: Hit: +4, reach 5 ft. 5 (1d6

• 2) Piercing damage, or 2 (1d4) Piercing damage if the

swarm is Bloodied.

Cacophony (Recharge 6). Wisdom Saving Throw: DC Failure: 10, one creature in the swarm’s space. The

target has the Deafened condition until the start of the swarm’s next turn. While Deafened, the target also has Swarm of Venomous Snakes Medium Swarm of Tiny Beasts, Unaligned AC 14 Initiative +4 (14) HP 36 (8d8) Speed 30 ft., Swim 30 ft. 8 −1 −1 18 +4 +4 11 +0 +0 S D C 1 −5 −5 10 +0 +0 3 −4 −4 I W C Resistances Bludgeoning, Piercing, Slashing Immunities Charmed, Frightened, Grappled, Paralyzed, Petrified, Prone, Restrained, Stunned Senses Blindsight 10 ft.; Passive Perception 10 Languages None CR 2 (XP 450; PB +2)

Traits

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 snake. The swarm can’t regain Hit Points or gain Temporary Hit Points.

Actions

Bites. Melee Attack Roll: Hit: +6, reach 5 ft. 8 (1d8 + 4) Piercing damage—or 6 (1d4 + 4) Piercing damage if the swarm is Bloodied—plus 10 (3d6) Poison damage. Tiger