Balloon Spider

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.