I had like 4 more alterations, a few of them being forcing a creature to attack its ally but that is either going to be OP or boring, and forcing your tortured past directly into their mind causing a random reaction from a table but that was too emo and unreliable IMO so I ended up with this. Anything underlined you are free to reword/change.
Eonans Fury
Type: Wonderous Item
Bloodied silk hilt wrap
Rarity: Legendary-Only equipable by Eonan
Once per encounter as a bonus action you may projectyour psychotic ragedirectly into a single creatures psyche within 10 feet of your character causing the creature to feela portion of your anguish.
On a failed save the creatures takes 2d12+cha+int mod in psychic damage and gain effect paralyzed(treated as fear for immunity purposes) for 1 round DC20 wisdom save for half damage and negates effect. If the creature is already under any psychic stress i.e. fear, frightened or otherwise unable to guard its mind the damage is treated as a critical hit.
And below is the future as you gain power
failed save the creature permanently lose 1d4 minus 1 intelligence.
If a creature is killed this way it dies in such a horrible manner that any other enemy creature that can see it die must immediately make DC15 wisdom save or be frightened. On failure they may make another wisdom save at the start of their turn.