Clockwork Boulder Strider

False Appearance. If the spider is motionless, has its eyes and mouth closed, and has its legs wrapped around its body at the start of combat, it has advantage on its initiative roll. Moreover, if a creature hasn’t observed the spider move or act, that creature must succeed on a DC 18 Intelligence (Investigation) check to discern that the spider is anything other than an boulder.

Unusual Nature. The spider doesn’t require air, food, or water.

Core Armor.  Plated with Collapsed Star Heart Fragments collected from MUSTAKRAKISH I&II. Provides extreme durability offering a Toughness of 15(damage under this threshold from the initial source leads the attack to deal no damage. If the initial source of an attack deals damage equal to or greater than the threshold then all damage for the attack penetrates.), while giving it a dark grey boulder ascetic.

Multiattack. The spider makes two Web Strand attacks, uses Reel, and makes two Bite attacks.

Bite. Melee Weapon Attack: +13 to hit, reach 10 ft., one target. Hit: 21 (3d8 + 8) piercing damage plus 10 (3d6) bludgeoning damage.

Web Strand. Ranged Weapon Attack: +13 to hit, reach 120 ft., one creature. Hit: The target is grappled (escape DC 18). The web strand can be attacked and destroyed (AC 12; 30 hit points; vulnerability to lightning damage; immunity to fire, bludgeoning, poison, and psychic damage). The spider can grapple up to four creatures at a time using its web strands.

Reel. The spider pulls each creature grappled by it up to 60 feet straight toward itself.