Arcane Assassin (5e Creature)
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Medium humanoid (any race), any non-good alignment
Saving Throws Dex +6, Int +5
Evasion. If the assassin is subjected to an effect that allows it to make a Dexterity saving throw to take only half damage, the assassin instead takes no damage if it succeeds on the saving throw, and only half damage if it fails.
Sneak Attack (1/Turn). The assassin deals an extra 14 (4d6) damage when it hits a target with a weapon attack and has advantage on the attack roll, or when the target is within 5 feet of an ally of the assassin that isn't incapacitated and the assassin doesn't have disadvantage on the attack roll.
Spellcasting. The assassin is a 9th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 13, +5 to hit with spell attacks). The assassin has the following wizard spells prepared:
Cantrips (at will): fire bolt, light, mage hand, prestidigitation
Multiattack. The assassin makes two shortsword attacks and casts a cantrip.
Shortsword. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 7 (1d6 + 4) piercing damage, plus 7 (2d6) damage of one of the following types (assassin's choice): acid, cold, fire, force, or lightning.
Trained in magic and the art of killing, arcane assassins lurk in the darkness, waiting for the time to strike. They can channel magic through their blades, which manifests as destructive energy.