Multiattack

The phase spider makes one Barbed Legs attack and one Bite attack. It can replace one attack with a Phasing Web attack.

Barbed Legs

_Melee Weapon Attack:_ +5 to hit, reach 10 ft., one target. _Hit:_ 8 (2d4+3) piercing damage.

Bite

_Melee Weapon Attack:_ +5 to hit, reach 5 ft., one creature. _Hit:_ 7 (1d10+3) piercing damage, and the target must make a DC 13 CON save, taking 13 (3d8) poison damage on a failed save, or half as much damage on a successful one. If the poison damage reduces the target to 0 HP, the target is stable but poisoned for 1 hour, even after regaining HP, and is paralyzed while poisoned in this way.

Phasing Web

_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 target can see and attack creatures on the Ethereal Plane, and the restrained target can be seen and attacked by creatures on the Ethereal Plane. A creature, including the restrained target, can take its action to free the target from the webbing by succeeding on a DC 13 STR check. The webbing can also be attacked and destroyed (AC 12; HP 10; vulnerability to fire damage; immunity to bludgeoning, poison, and psychic damage).