Ethereal Jaunt. As a bonus action, the spider can magically shift from the Material Plane to the Ethereal or Abyssal Plane, or vice versa.

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

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

Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., one creature. Hit: 14 (2d10 + 5) piercing damage, and the target must make a DC 14 Constitution saving throw, taking 21 (6d8) 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.

Poison Spray (Recharge 5–6). The Brood Queen sprays poison in a 15-foot cone. Each creature in that area must make a DC 14 Dexterity saving throw, taking 22 (4d10) poison damage on a failed save, or half as much damage on a successful one.

Web Snare.  Slams a nearby tree, rock, or wall to bring webbing down on an enemy.  They must make a DC 15 Dexterity saving throw or be restrained.  At the end of their turn they can make a DC 16 Strength saving throw to free themselves or another creature can us an action to free them.

Cannibalize.  Devours one of it's broodlings to regain (24) 5d10 health. 

Call Brood.  Calls 2 broodlings to come its aid.  Broodlings use the Phase Spider stat block.