Cupiditatem

You manipulate the image and nature of an object, a creature, or some other material that is no larger than a 5-foot cube. The object or creature is then shrouded in a bewitching appearance, seen as a haze or mirage when viewed with true vision. The first time a creature looks at the spell target, they must make an intelligence save. On a successful save, the creature is aware of the deceit, and is capable of recognizing the original shape, the other sensory qualities becoming faint to the creature.

On a failure, the target is subjected to an image of an object or person of their deepest desire, becoming charmed towards both the caster as well as the spell target. The victim is both convinced of the illusions authenticity as well as non-cognizant of the situation that lead to the illusion (illusion is of a dead person, the object is at another confirmed location, etc.)  At the DM's discretion, the transfixing effect of the illusion can be strong enough to force combat between two previously friendly creatures who have failed the save.

Creatures who have failed the save can use their action to examine the image and determine that it is an illusion with a successful Intelligence (Investigation) check against your spell save DC, but only if they have the opportunity to closely inspect the object or person, or have had their suspicions roused by another creature.

At Higher Levels. When you cast this spell using a spell slot of 7th level, the spell lasts an hour. At 8th level, it lasts 12 hours. When cast using a 9th level spell slot, it lasts until dispelled, without requiring concentration.