The drider’s innate spellcasting ability is Wisdom (spell save DC 13). The drider can innately cast the following spells, requiring no material components:
Morbid Construction. The diesel drider has advantage on saving throws against being Charmed or intimidated, and magic can’t put the diesel drider to sleep. however, it has disadvantage on Charisma checks.
Spider Climb. The diesel drider can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.
Web Walker. The diesel drider ignores movement restrictions caused by webbing.
Multiattack. The diesel drider makes three attacks, one with its chainsword, one with its longbow, and one with its grappling hook.
Grappling Hook. Ranged Weapon Attack: +6 to hit, range 75/150 ft., one target. Hit: 2 1d8+3 piercing damage and the target is grappled for the next 2 rounds. the target must make a str check each round, on a fail they will be dragged toward the diesel drider by 30 ft and half on a success.
Chain Sword. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 15 1d8+3 slashing damage.
Arm Cannon. Ranged Weapon Attack: +6 to hit, range 100/150 ft., one target. Hit: 15 1d8+3 piercing damage.