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

[Hohige]

No, the target knows they took damage. They're not going to just stand there and keep taking it. Just running away thwarts your dastardly plan, and, in social engagements, knowing there's a hidden assassin using mind magic is going to get bad quickly for anyone that could be considered suspicious -- like a sorcerer that's just come visiting. Your awareness of any broader context is lacking.

Psychic Damage hasn't visible effect. They don't know about damaging.
The Mind Spike knows the target location for 1 hour.
On a failed save, you also always know the target's location until the spell ends, but only while the two of you are on the same plane of existence. While you have this knowledge, the target can’t become hidden from you, and if it’s invisible, it gains no benefit from that condition against you.

 

[Shadowedeyes]

If you take damage, you know you took damage. You might not know the exact source of said damage, but when my hypothetical barbarian suddenly loses 15 hit points I'm not just going to stand there and comment on how it must be the wind or something.

 

[Hohige]

If you take damage, you know you took damage. You might not know the exact source of said damage, but when my hypothetical barbarian suddenly loses 15 hit points I'm not just going to stand there and comment on how it must be the wind or something.

I would interpret psychic damage without visual effects as a severe headache, hallucinations and madness.
Mental exaustion.

 

[Shadowedeyes]

A headache that can literally kill you. The kind of pain you'd be in would definitely exclude someone from thinking it's an ordinary occurrence

I would interpret psychic damage without visual effects as a severe headache, hallucinations and madness.
Mental exaustion.

 

[Hohige]

A headache that can literally kill you. The kind of pain you'd be in would definitely exclude someone from thinking it's an ordinary occurrence

DM territory.

 

[Shadowedeyes]

It's how I would rule as a DM. Trying to divorce HP knowledge from players and their characters has too many headaches that start popping up. Can a character know if they are close to dying? Can a cleric accurately tell who needs healing the most? Does the player get to know about the hidden mind spiking damage, or does the DM just tell them they have a headache and suddenly, surprise, you're dead(As a DM that would not go over well I think.)?

 

[Ovinomancer]

Sorcerer vs Sorcerer is a fair battle.
What a wizard can do against it?
Subtle is 1 sorcery point only.

Subtle Spiritual Shroud, regain his sorcery points converting level 1 spell slot.
Empower and Unerring spell can be used if the damage rolls is bad or misses an attack.
They are very efficient resources, only used when the dice rolls is bad or its attack has failed.

Against at maximum 13 AC Wizard. It's dead.

Diviner Wizard, 1 lowish roll on Portent, upcasts own counterspell to 4th, use portent to cause subtle counterspell to fail, ruins alpha strike. On their turn, casts Charm Monster -- targets your terrible WIS save (+3) at DC 17. Wizard wins.

 

[Hohige]

Diviner Wizard, 1 lowish roll on Portent, upcasts own counterspell to 4th, use portent to cause subtle counterspell to fail, ruins alpha strike. On their turn, casts Charm Monster -- targets your terrible WIS save (+3) at DC 17. Wizard wins.

That was funny.
"He will give me a fatal attack", I will upcast to level 4 shield (Because I have sure that is a fatal damage and he can counterspell me, I bealive) and now I will have 18 AC and use portent 1 (Portent does not work like this, you need to roll 2d20, It could be a 19 and 20)
lol.
I used a theorical 1 portent, and he used Magical Guidance to reroll the counterspell or he just upcasted Counterspell.
Also, Surprised I can't use reaction.
WTF.

Said the Wizard with 70 HP. x 140 damage with "advantage".

 

[Ovinomancer]

That was funny.
"He will give me a fatal attack", I will level upcast 4 (Because I know that is a fatal attack and he can counterspell me, I know it) and now I will have 18 AC and use portent 1 (Portent does not work like this, you need to roll 2d20, It could be a 19 and 20)
lol.
I used a theorical 1 portent, and he used Magical Guidance to reroll the counterspell or he just upcasted Counterspell.
Also, Surprised I can't use reaction.
WTF.

Said the Wizard with 70 HP. x 140 damage with "advantage".

You have to use your reaction to determine what level the spell is being cast at, which defeats counterspell. Or, he just upcasts to 5th, because you've used both your 5th level slots and can't go that high. I mean, if you get such perfect knowledge, so does the other guy.

 

[Hohige]

You have to use your reaction to determine what level the spell is being cast at, which defeats counterspell. Or, he just upcasts to 5th, because you've used both your 5th level slots and can't go that high. I mean, if you get such perfect knowledge, so does the other guy.

No?
Sorcerers have a lot of high level spells slots. It's called Sorcerer's Flexible casting. Converting low level spells slots to a higher level spell for a worth battle.
The Sorcerer potentially has 8, 5th spell slot.
They can't choose 1 on portent (It has two d20, not 1), also, Magical Guidance to reroll a failed counterspell's check. You can't use reaction while surprised and yes, the sorcerer can upcast it to level 5.
And no, Shield won't save the wizard against that alpha attack.
The Wizard is dead.