Brood Spider

Brood Spawn. The brood spider has advantage on saving throws against being charmed, and magic can’t put the brood spider to sleep.

Regeneration. The brood spider regains 10 hit points at the start of its turn if blood has been spilled this round. If the brood spider takes radiant damage or damage from holy water, this trait doesn't function at the start of the brood spider's next turn.

Sanguine Slip. As a bonus action, the spider can magically turn into bloodmist, teleporting to any space large enough to fit it. The space must be within line of sight.

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

Sunlight Sensitivity. While in sunlight, The brood spider has disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight.

Web Sense. While in contact with a web, the brood spider knows the exact location of any other creature in contact with the same web.

Web Walker. The spider ignores movement restrictions caused by webbing.

Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 7 (1d10 + 2) piercing damage, and the target must make a DC 11 Constitution saving throw, taking 18 (4d8) 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.

Spider Grapple. Melee Weapon Attack: +6 to hit, reach 5 ft., one creature. Hit: 8 (2d4 + 3) bludgeoning damage. Instead of dealing damage, the brood spider can grapple the target (escape DC 13).