u/chunchunmaru1129

I personally am not sure about class skills and what rank clairvoyance and independent action should be and I'm also not sure about personal skills.

As for parameters:

Strength: A.

Endurance: C.

Agility:A

Mana: B.

Luck: E-.

Noble Phantasm: EX.

As for his noble Phantasm's he would have multiple different noble Phantasm's and I think he shouldn't have Vasavi Shakti and Kavacha Kundala as I'm using the 17th day version of him during the kurekhetra war as that is thought to be his peak as a Archer.

Vijaya Bow: EX(Anti Unit)It acts as his ultimate defensive and offensive buffer. While holding Vijaya, Karna gains massive conceptual resistance against all physical and magical projectiles—effectively replacing his lost Kavacha and Kundala armor through pure weapon supremacy. Furthermore, it acts as a force multiplier, doubling the destructive rank of any arrow shot from it.

Bramhastra:A+(Anti Army)It would be a homing, tracking, conceptual missile. Once fired, it locks onto the opponent's spiritual core and cannot be dodged, forcing the enemy to either block it with equal divine energy or be vaporized by the nuclear-level blast radius.

Bramhshira Astra:EX(Anti-Land/Anti-Purge)4 times stronger than the standard Bramhastra but when Karna is at his most vulnerable and is near certain death he would forget how to use this and also Bramhastra.

Sentient Nagastra:A(Anti Personal)This wouldn't just be a projectile; it would function like a Sentient/Autonomous Noble Phantasm (similar to Orion's relationship with Artemis or Gilgamesh’s autonomous tools). Once shot, it has its own independent thoughts, tracking capabilities, and an intense malice against the target. It can change direction mid-air to bypass physical shields, acting as a perfect, unpredictable assassination tool.

Bhagarvastra:A++(Anti Army)This would be his ultimate crowd-control and map-wipe Noble Phantasm. Instead of a single blast, it turns the sky into a localized cataclysm, raining down a torrential downpour of conceptual light arrows. For a standard Servant, dodging or parrying is completely impossible due to the sheer volume of attacks.

So how did I do?

Every single time he dies after using Excalibur then Alaya immediately resummons him again and has him use Excalibur again and again for as long as it wants.

Basically he absorbs Archer Emiya's Parameters,personal skills,class skills and also his catalog of Noble Phantasm in his Unlimited Blade Works and also his fighting ability and experience.

Also by absorbing Emiya's powers I mean he basically becomes Emiya.

By magi I mean Magecraft users during his time so no True Magic wielders or Magi who have become a Dead Apostle.

Again in this hyphothetical Scenario he basically becomes Archer Emiya in every area and just as strong as him.

The only one who comes to my mind is Susano'o and maybe Shiva because of Sakura being for Parvati,Durga and Kali.