False Appearance. So long as the geode spider remains motionless, it is indistinguishable from a boulder or other natural rock formation.
Spider Climb. The geode spider 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 stone arachnid knows the exact location of any other creature in contact with the same web.
Web Walker. The geode spider ignores movement restrictions caused by webbing.

Multiattack. The geode spider makes two slam attacks.
Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 20 (3d10 + 4) piercing damage plus 7 (2d6) acid damage..
Slam. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 18 (4d6 + 4) bludgeoning damage.
Web (Recharge 4-6). Ranged Weapon Attack: +4 to hit, range 30/60 ft., one creature. Hit: The target is restrained by webbing and must make succeed on a DC 15 Constitution saving throw or be petrified. Any creature that begins its turn in contact with the web, must also make this saving throw or be petrified. As an action, the restrained target can make a DC 13 Strength check, bursting the webbing on a success.The webbing can also be attacked and destroyed (AC 10; hp 20; immunity to fire, bludgeoning, poison, and psychic damage).