Innate Spellcasting. The arcanaloth's innate spellcasting ability is Charisma (spell save DC 15). The arcanalth can innately cast the following spells, requiring no material components:   At will: alter self, darkness, heat metal, invisibility (self only), magic missile     Spellcasting. The arcanaloth is a 16th level spellcaster. Its spellcasting ability is Intelligence (spell save DC 17, +9 to hit with spell attacks). The arcanaloth has the following wizard spells prepared:   Cantrips: firebolt, mage hand, minor illusion, prestidigitation   1st Level (4 slots): detect magic, identify, shield, Tenser's floating disk   2nd Level (3 slots): detect thoughts, mirror image, phantasmal force, suggestion   3rd Level (3 slots): counterspell, fear, fireball   4th Level (3 slots): banishment, dimension door   5th Level (2 slots): contact other plane, hold monster   6th Level (1 slot): chain lightning   7th Level (1 slot): finger of death   8th Level (1 slot): mind blank

Magic Resistance. The arcanaloth has advantage on saving throws against spells and other magical effects.   Magic Weapons. The arcanaloth's weapon attacks are magical.