Thoughtbound Phantasm

While wearing the Circlet you can telepathically implant an illusion into the minds of all creatures that you can see and are within 30ft of you (this includes any creatures that move within the area of effect during the spells duration).

Affected creatures (which include you as the caster) see a spectral effigy of a semi corporeal floating skeleton appear within 30ft of you that lasts for the Duration of the spell, until your Concentration ends or until you cast this spell again.The illusion is silent and cannot make any sound, although you can use other means to make sound emanate from it (such as via ventriloquism abilities or minor illusion cantrips), nor can the illusion move more than 30ft away from you.

When you cast this spell, and on each turn during its duration, you can use a Bonus Action to have the Phantasm make either a "slam attack" (melee spell attack) against a creature within 5 feet of the illusion or "fire an eldritch beam of energy" (ranged spell attack) against a target with 30ft of the illusion. On a hit, the target takes Psychic damage equal to 1d6 + your spellcasting ability modifier. You must be able to see the target in order to attack it.

In addition, any target taking Psychic damage from the Thoughtbound Phantasm must make an Intelligence Saving throw against your Spell DC or become Frightened of the Phantasm. A creature affected by this frightened condition can attempt a further Intelligence Saving throw at the end of each of its turns, ending the effect on a successful save.

As a Bonus Action on your turn, you can move the illusion up to 30ft and use either another melee or ranged attack against a creature you can see.

A final effect is called Empower Phantasm, if you use a spell slot of 1st level or higher to cast a divination spell whilst concentrating on the Thoughtbound Phantasm, you siphon off some divination magic to empower the phantasm, doing so causes the damage you inflict with it to increase by cumulative 1d6 per Divination spell you cast. This extra damage lasts until the Duration ends, you lose concentration or you recast Thoughtbound Phantasm.

Important:

Creatures that are Immune to Divination Magic, Immune to Illusions, Immune to Psychic damage, Immune to having their minds/thoughts read or that have an Intelligence of 3 or lower cannot perceive the illusion or be affect by this spell. In such instances you feel as if your thoughts have been pushed against some intangible barrier or force and know a creature is not affected but not the reason why.

At Higher Levels: When you cast this spell using a spell slot 3rd level of or higher, the damage increases by 1d6 and you no longer need to maintain concentration on the spell, and the if you use a slot of 5th level or higher the range to which you can affect creatures becomes line of sight and you can move the illusion anywhere within your line of sight, but it is still restricted to moving a maximum of 30ft per turn.