Multiattack

The ghostwalk spider makes two bite attacks. It can make a ghostly snare attack in place of one of its bites.

Bite

Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 16 (2d10 + 5) piercing damage plus 13 (3d8) poison damage, or half poison damage with a successful DC 15 Constitution saving throw. If the poison damage reduces the target to 0 hit points, the target is stable but poisoned and paralyzed for 1 hour, even after regaining hit points. While using Ghostwalk, the spider's bite and poison do half damage to targets that aren't affected by Ghostly Snare (see below).

Ghostly Snare (During Ghostwalk Only, Recharge 5-6)

Ranged Weapon Attack: +9 to hit, range 40/160 ft., one target. Hit: The target is restrained by ghostly webbing. While restrained in this way, the target is invisible to all creatures except ghostwalk spiders, and it has resistance to acid, cold, fire, lightning, and thunder damage. A creature restrained by Ghostly Snare can escape by using an action to make a successful DC 14 Strength check, or the webs can be attacked and destroyed (AC 10; hp 5).