D&D 5E Aberrant Mind's Psionic Sorcery is officially the most powerful feature.

[Hohige]

Casting subtle invisibility is a pointless waist of sorcery points (yes, I realise you character has infinite sorcery points, but the rest of us can't aford to waste them). If you are in plain sight of a guard and you cast Invisibility they will know you are invisible no matter how subtle your spell was. If you cast invisibility before the guard sees you then there is no point in making it subtle because they wont see you cast it anyway.

Of course, the most likely situation is the guard sees you because you failed your passive perception check and you are unaware of them.

You are hidden behind a wall, cast subtle Invisibility and you pass Through guards or defeat them.
Guards? Psionic Sleep/Mind Spike/Enemies abound/Snipatic Static/Dominate.

The Aberrant Mind is unstoppable.
A Sorcerer level can has a lot of Sorcery Points converting spells slots.

 

[Maxperson]

Highlights

Stealth Casting

Stealth check: +4 Dex, Double Proficiency +8 for +12 Stealth check. That is enough to win most passive perception.
Pass without Trace adds +10, for Sweep +22 Stealth check.

A 15 dex is only +2 and if you are going to be dominating or casting any other spell with concentration, you don't have Pass Without Trace on, so +10. And I've noticed that players don't like to be surprised by stealthy creatures, so you can count on multiple PCs, if not the entire party, having proficiency at Perception. With 4+ rolls, the odds are that someone is going to see you.

He can freely cast any spell with Psionic Sorcery or Subtle metamagic without leaving the Hidden condition.
Mental spells like Mind Spike, Dominate Person, Dissonant Whisper, Snyptic Static have no visible effects and can simply end the beginning with impunity.

As has been noted, there is no hidden condition and you can become unhidden without a roll if circumstances warrant. In any case, you aren't casting more than one or two spells from hiding before you can't do that anymore. At last not without eating up spell slots that will lessen your ability to handle future encounters, hurting the party.

Subtle Greater Invisibility / Invisibility, Stealth Check and Psionic Spell can simply wipe out the enemy anywhere.
If you fail a stealth casting, so Magical Guidances allows a new check.

So yet more concentration spells. Do you guys not use the concentration rules? If so, that might explain why you think the Sorcerer is so much more powerful than the rest of us do.

Making your party love you:

Twinned Polymorph into Giant Apes for Sweet damage, moviment and 150 tempo HP

Twin Greater Invisibility and your party will love you!
Spam Psionic Dissonant Whisper for party' free oportunity attack.
Dominate a creature with a powerful magical item and give it to your adventure friend

Long range spellcasting and movimentation:

You will certainly adopt casting powerful Distant Insect Plagues at the enemy at 620fts. Or cast Psionic Snapic Static at 300ft.
Psionic Dominate Person at 120ft.
Distant Dimension door for quicken position.
The advantage possibilities in ranged attacks are incredible.

Go into Melee:

Quicken Polymorph into a Giant Ape and multiattacking in the same turn is always fun. Do this and beautiful punches for 50 damage.
Upcasting Inflict Wounds is always fun.

The best mage slayer ever:

Your spells cannot be contraspelled and you can easily subtle counterspell.
Subtle Dispel removes any magical protection from them.

The beating is guaranteed.
but why kill if you can control them? it's fun.


Disabling Spells:

Heightein Hypnotic Patter, Psionic Upcasting Sleep, Psionic Dominate Person, Heightein Fear are always, wtf is that?

Damage resistance immunity?

Don't worry, Subtle Earth Eruption solves this.

Any sorcerer can use metamagic. These aren't a function of the psionic ability.

The best summoner:
An Aberrant Mind Sorcerer level 10 using Psionic Sorcery to cast Summon Aberration upcasted to level 9. Yes, Psionic Sorcery allows it.

Even without seeing it, I can say that no it doesn't. There's no way that WotC is going to give one and only one spell caster the ability to cast higher level spells than the spell level slots available to the PC. At 10th level the highest level spell you will be casting is 5th.

 

[Maxperson]

You are completely wrong. The build Works pretty fine, no other can Challenge or compete against this.
Stealth isnt stay behind a wall. You can move silently, roll a stealth check against passive perception. If sucessful you are hidden for that creature.
Also, subtle Greater Invisibility/Invisibility is always useful.

Hidden is not invisibility. You have to have something to hide behind. If your sorcerer is in a room with a box and that's what allows you to make the hide check, you don't get to move silently to anywhere else in the room without becoming unhidden. If anyone walks around the box, you are unhidden without them needing to make a roll.

 

[Hohige]

Hidden is not invisibility. You have to have something to hide behind. If your sorcerer is in a room with a box and that's what allows you to make the hide check, you don't get to move silently to anywhere else in the room without becoming unhidden. If anyone walks around the box, you are unhidden without them needing to make a roll.

What happens If you can be hidden and invisible?
The Aberrant Mind is versatile.

 

[Olrox17]

You are hidden behind a wall, cast subtle Invisibility and you pass Through guards or defeat them.
Guards? Psionic Sleep/Mind Spike/Snipatic Static/Dominate.

The Aberrant Mind is unstoppable.
A Sorcerer level can has a lot of Sorcery Points converting spells slots.

You're exploring a dark dungeon (I'm guessing your custom race has darkvision). You're using pass without trace to be very stealthy. Your 10th level sorcerer walks into a room, apparently empty. Unfortunately, the room isn't empty. 4 succubus lie in ambush (a pretty normal encounter for a 10th level party).
They have +7 stealth, so you don't see them unless they roll terribly, and you walk past your hiding spot, feeling safe. You're now in the open, they see you, you are surprised and most likely super-dead.

 

[Hohige]

You're exploring a dark dungeon (I'm guessing your custom race has darkvision). You're using pass without trace to be very stealthy. Your 10th level sorcerer walks into a room, apparently empty. Unfortunately, the room isn't empty. 4 succubus lie in ambush (a pretty normal encounter for a 10th level party).
They have +7 stealth, so you don't see them unless they roll terribly, and you walk past your hiding spot, feeling safe. You're now in the open, they see you, you are surprised and most likely super-dead.

The Sorcerer has divination spells and teleportation spells. 1000ft

 

[Olrox17]

Sorry. The Sorcerer stealth roll is +12 with advantage, If It fails Magical Guidance allows a new roll.

Your stealth is completely useless. You didn't see your enemies lying in ambush, and you walked past them. They see you automatically. You're dead.
You're interpreting the stealth rules like D&D is some Skyrim-like videogame. It isn't.

EDIT: you edited your post. Teleportation won't help when you get surprised and killed before you have a chance to cast. And what divination spells? I only saw clairvoyance on your list, and that won't really help.

 

[Hohige]

Your stealth is completely useless. You didn't see your enemies lying in ambush, and you walked past them. They see you automatically. You're dead.
You're interpreting the stealth rules like D&D is some Skyrim-like videogame. It isn't.

I play Baldur Gate 3. Its 5e. Stealth there is amazing.
Good Lucky with divination spells and 1000ft teleportation.

 

[Olrox17]

I play Baldur Gate 3. Its 5e. Stealth there is amazing.
Good Lucky with divination spells and 1000ft teleportation.

You just confirmed my suspicions. You interpret stealth like D&D it's a videogame (one that's also in open beta, btw). That crap doesn't fly with a half decent human DM, I assure you.

 

[Hohige]

You just confirmed my suspicions. You interpret stealth like D&D it's a videogame (one that's also in open beta, btw). That crap doesn't fly with a half decent human DM, I assure you.

This build is complete. Social god. Combat god. Divination, teleportation, stealth casting, high AC, damage, suporte sprlls A lot of useful spells.
But, If DM wants defeat you. It Will.