Aspect of the Sphere

Magic Sense. The Aspect can instantly sense if a creature can cast spells or not.

Innate Spellcasting. The Aspect's spellcasting ability is Intelligence. It can innately cast the following spells, requiring no material components:

At will: Bestow Curse, Thunder Step, Cube Strike

3/day each: Arcane Hand, Steel Wind Strike

2/day each: Whirlwind, Forcecage

1/day: Sphere Crush

Multiattack. The Aspect makes 3 attacks with it's sword.

Rolling Blade Sphere. Melee Weapon Attack: +16 to hit, reach 5 ft., 1 target. Hit: 17 (2d6 + 10) Slashing damage + 4 (1d6) Radiant damage + 4 (1d6) Necrotic damage + 4 (1d6) Force damage. 

Booming Command (Recharge 5-6). The Aspect calls those around them to listen. Every creature within 60 ft. of the Aspect must make a Wisdom saving throw (DC 16) or be charmed for 1 minute. Creatures touching something made out of the metal of the Sphere have disadvantage on this saving throw. The Aspect can issue a command to one creature charmed in this way as an action on it's turn. The creature must follow the command to the best of it's ability on it's next turn, provided the action doesn't directly harm the creature. After that creature completes the action, it can make the Wisdom saving throw again with advantage, ending the charm on a successful save.

Sphere-Sight. The Aspect immediately knows the location of every piece of metal made out of the Sphere in 300 ft. of it, and it knows whether or not that metal is being touched by a creature.

The Aspect can make 3 legendary actions, and can only make them at the end of another creatures turn. It regains all legendary actions at the start of its turn.

Strike. The Aspect makes an attack with its Rolling Sphere Sword.

Command (2 actions). The Aspect commands a creature charmed by its Booming Command ability, as described in the ability.

Cast (2 actions). The Aspect casts a spell that it can cast at will.