Armor Class: 12 + the level of the spell (natural armor)
Hit Points: 30 + 10 for each spell level above 3rd
Proficiency Bonus: equals your bonus
Multiattack. The fey makes a number of attacks equal to half this spell's level (rounded down).
Shortsword. Melee Weapon Attack: your spell attack modifier to hit, reach 5 ft., one target. Hit: 1d6 + 3 + the spell's level piercing damage + 1d6 force damage.
Fey Step. As a bonus action, the fey can magically teleport up to 30 feet to an unoccupied space it can see. Then one of the following effects occurs, based on the fey's chosen mood:
Fuming. The fey has advantage on the next attack roll it makes before the end of its turn.
Mirthful. The fey can choose a creature it can see within 10 feet of it and force it to succeed on a Wisdom saving throw against your spell save DC. Unless the save succeeds, the target is charmed by you and the fey for 1 minute until the target takes any damage.
Tricksy. The fey can fill a 5-foot cube within 5 feet of it with magical darkness, which remains until the end of its next turn.