Innate Spellcasting (Psionics). The arachnillithid's spellcasting ability is Intelligence (spell save DC 12). It can innately cast the following spells, requiring no components:
At will: mind sliver
3/day each: detect thoughts
1/day each: suggestion, levitate
Spider Climb. The 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 spider knows the exact location of any other creature in contact with the same web.
Web Walker. The spider ignores movement restrictions caused by webbing.
Multiattack. The arachnillithid makes two melee attacks and casts a spell.
Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one creature. Hit: 7 (1d8 + 3) piercing damage, and the target must make a DC 12 Wisdom saving throw, taking 9 (2d8) psychic damage on a failed save, or half as much damage on a successful one. The target must also make a DC 12 Strength saving throw or be grappled by the arachnillithid (escape DC 12).
Extract Brain. Melee Weapon Attack: +5 to hit, reach 5 ft., 1 incapacitated humanoid grappled by the arachnillithid. Hit: 11 (2d10) piercing damage. If this damage reduces the target to 0 hit points, the arachnillithid kills the target by devouring its brain.
Web (Recharge 5–6). Ranged Weapon Attack: +5 to hit, range 30/60 ft., one creature. Hit: The target is restrained by webbing. As an action, the restrained target can make a DC 12 Strength check, bursting the webbing on a success. The webbing can also be attacked and destroyed (AC 10; hp 5; vulnerability to fire damage; immunity to bludgeoning, poison, and psychic damage).
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