Spider, Balloon

Medium beast, unaligned

Armor Class 13
Hit Points 36 (8d8)
Speed 20 ft., fly 40 ft. (hover)

10 (+0) 16 (+3) 10 (+0) 2 (-4) 12 (+1) 4 (-3)

Skills Perception +3
Damage Immunities lightning
Senses blindsight 10 ft., darkvision 60 ft., passive Perception 13
Challenge 1 (200 XP)


  • Erratic Discharge. A creature that starts its turn within 10 feet of the balloon spider must make a DC 12 Constitution saving throw. On a failure, the creature takes 2 (1d4) lightning damage and can move or take an action on its turn, but not both. On a success, the creature gains the benefits of the haste spell until the end of its turn. If a creature’s saving throw is successful, it is immune to the spider’s Erratic Discharge for the next 24 hours.


  • Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one creature. Hit: 5 (1d6 + 2) piercing damage plus 5 (2d4) lightning damage, and the target must succeed on a DC 12 Constitution saving throw or it can move or take an action on its turn, but not both.
  • Charged Web (Recharge 4-6). Ranged Weapon Attack: +5 to hit, range 40/80 ft., one creature. Hit: The target is grappled (escape DC 13) by strands of charged webbing and begins to hover off the ground. Until this grapple ends, the target takes 1 lightning damage at the start of each of its turns. In addition, the grappled target can make a DC 12 Dexterity (Acrobatics) check to manipulate the strands of webbing and fly 10 feet in any direction.
  • Draw In. The balloon spider magically pulls all creatures grappled by its webbing up to 10 feet toward it. If this movement pulls the creature within 5 feet of the balloon spider, the spider can make one bite attack against the creature as a bonus action.


Honed by evolutionary processes, the balloon spider has perfected the art of ballooning, floating through the air held aloft by strands of webbing suspended by electromagnetic fields. Electrified mandibles grant these spiders precise control over nearby electromagnetic fields and a potent weapon for shocking its prey.

Beneath their hunting grounds, the corpses and bones of their prey lie sparsely coated with stray strands of blue webbing. These remains wobble and glide across the ground of their own accord, caught in stray eddies in the electromagnetic field. The webbing of a balloon spider is prized by arcanists as a component for spells and the construction of magical flying machines.

Section 15: Copyright Notice

Tome of Beasts 2. © 2020 Open Design LLC; Authors Wolfgang Baur, Celeste Conowitch, Darrin Drader, James Introcaso, Philip Larwood, Jeff Lee, Kelly Pawlik, Brian Suskind, Mike Welham.

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