Annihilator

Your newly discovered origin ensures you always have certain spells prepared. You know the following spells and they do not count towards the number of spells you can prepare.

Your will is like the beings that survive in Acheron. You have advantage on saving throws against being Charmed. Once per long rest you can use a bonus action to impose disadvantage on a saving throw to Charm a creature.

Your spells eat away at the minds of those you fight. After a creature fails a WIS saving throw on a spell you cast and the effect ends they are racked with torment, taking Psychic damage equal to half your Sorcerer level rounded down.

You can critically analyze creatures and determine if they are Charmed, Frightened, or are not who they say such as a shapechanger assuming the form of someone you are familiar with. You can attempt a DC 8 + the original caster’s spell attack bonus or Shapechanger's s CHA modifier Insight check to determine exact effect of the spell or ability,

When a creature succeeds a saving throw against one of your spells from your Origin Spell list they have a sense of despair that gives their next attack or ability check a penalty equal to your CHA modifier (Minimum 1). This effect fades after one hour.

You tear down those that would try and be above you. When you are attacking a creature that has more hit points than you, you have a bonus to spell attack and attack rolls equal to your CHA modifier (Minimum 1) and you deal an additional 2D6 Psychic damage if this bonus was applied.