Galvantula (5e Creature)
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Medium elemental, any alignment
Spider Climb. The galvantula can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.
Web Sense. While in contact with a web, the galvantula knows the exact location of any other creature in contact with the same web.
Web Walker. The galvantula ignores movement restrictions caused by webbing.
Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one creature. Hit: 6 (1d6 + 3) piercing damage plus 4 (1d8) lightning damage, and the target must make a DC 13 Constitution saving throw, taking 9 (2d8) poison damage on a failed save, or half as much damage on a successful one. If the poison damage reduces the target to 0 hit points, the target is stable but poisoned for 1 hour, even after regaining hit points, and is paralyzed while poisoned in this way.
Electroweb (Recharge 5–6). Ranged Weapon Attack: +5 to hit, range 30/60 ft., one creature. Hit: The target is restrained by webbing. While restrained in this way, the creature takes 10 (3d6) lightning damage at the start of each of its turns. As an action, the restrained target can make a DC 12 Strength check, bursting the webbing on a success. The webbing can also be attacked and destroyed (AC 10; hp 5; vulnerability to fire damage; immunity to bludgeoning, lightning, poison, and psychic damage).
Galvantula have the ability to weave webs at ridiculous speeds, being able to create a wall of electric webs in seconds. In the wild, they use this trait to catch food, but when trained, they can do it to capture or evade enemies before coming back for another strike. Sometimes they hunt in groups, but not always since they're used to being alone in the forests they call home.