Arcane Blade

Spellcasting. The mage is a 4th-level spellcaster that uses Intelligence as its spellcasting ability (spell save DC 13; +5 to hit with spell attacks). The mage knows the following spells:

Cantrips (at will): light, mage hand, shocking grasp

1st Level (4 slots): zephyr Strike, magic missile, shield 

2nd Level (3 slots): hold person, misty step

Broadsword. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 3 (1d6 + 4) bludgeoning damage.

Sever The Weave (Recharge 6). One creature within 30 of the Arcane Blade must make a DC 13 constitution saving throw, or be unable to cast spells other than cantrips until the end of the Arcane Blade's next turn.

Aura Burst (Recharge 4-6). As a bonus action, you may force a creature within 15ft of you to make a Strength saving throw, or take 4d4 (4d4)  force damage, and be pushed up to 10ft horizontally, on a success they take half damage and are not pushed.

Azure Protection. As a reaction, when a creature within 5ft of the Arcane Blade takes damage, it may give the creature resistance to one of the damage types.

The Arcane Blade has 1 legendary action per round, it can use it to move up to 30ft, or make an attack with its broadsword.