Ethereal Fracture

Using an arcane whisper that fractures the mind and reality itself, you target a single creature within range. The target must make a Charisma saving throw. On a failed save, the creature suffers 8d8 psychic damage and is subjected to a series of debilitating mental effects as their psyche is twisted and torn apart by your magic. On a successful save, the creature takes half damage and avoids the additional effects.

Failed Save Effects:

1. Memory Scramble: The target's memories are jumbled. They lose proficiency in all skills they are proficient in for 1d4 days.
2. Spell Erosion: The target forgets spells or spell slots (DM's choice based on creature's spellcasting ability) starting from the highest level working downward, losing access to a number of spell levels equal to half the damage dealt.
3. Personality Fracture: The target's personality undergoes a dramatic shift, altering its alignment and possibly its intentions and loyalties, as determined by the DM.
4. Dimensional Dissonance: The target intermittently phases in and out of the Ethereal Plane uncontrollably for 1d4 hours, appearing and disappearing at the start of each of its turns.

The spell can also target objects, in which case the object is either completely erased from existence if it is non-magical or suffers a significant reduction in magical power for magical items, as determined by the DM.

The horrifying power of Ethereal Fracture not only inflicts immediate psychic trauma but also leaves lingering scars on the very essence of its victims, making it a fearsome spell reserved for the most powerful and daring spellcasters.

Arcane Feedback: Given the spell’s disruptive nature, there might be a chance of arcane feedback, especially if the spell is countered, resisted successfully, or interacts with a powerful magical artifact or entity. This feedback could result in the caster experiencing some of the spell's effects, such as temporary loss of spell slots or a mild form of the "Personality Fracture" effect.

Dimensional Attention: Utilizing a spell that fractures the very fabric of reality could attract unwanted attention from extra-dimensional beings or entities, such as the denizens of the Ethereal Plane, who might see the caster as a threat or an intriguing subject for study or vengeance.

Moral or Ethical Impact: Casting a spell that so profoundly affects the minds and realities of others might have a moral or ethical impact on the caster, potentially affecting their alignment, relationships with other characters, or standing with certain factions or deities within the game world.