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Fuse the 2 and you get the most powerful thing ever

Ok but like what if they didn't like eachother

Well still

Absolute Solver.

The Soul of Determination has the ability to cling to life after death to the point of manipulating time itself and reversing it, and it can do this infinitely

Solver. Period. There is no way flesh can win against literal arbitrary machinery assembly.

You underestimate the sheer power of Determination, the soul of Determination has the strength to kill some of the strongest beings to live in single blows, and has willpower strong enough to cling to life after death resulting in time reversal

Sowver can buiwd wobot UwU

Killed a robot DESIGNED to kill humans in a single blow

Solver can also just be taken apart on a smaller level, Determination isn't even tangible

The solver has backups. It's a program, not a state of existence. That's what a SOUL is, it's just the representation of one's existence.

True

Although a representation that in it's own lore could only be effected directly by magic, something solver lacks even with it's complicated technology, and even then...
The time rewinding stuff, the solver is a machine with programming and ultimately preset outcomes for all of it's actions, it would get predictable eventually just like anything else, how would it counter that?

Randomness through background radiation.

Maybe so, but even a machine with a comparable mind to a human can still become predictable once you've done the same thing over and over and over and over and over and over and over and over and over-... It will still become predictable, time reversal and rebirth are a cracked combo.

Since the human SOUL is unpredictable, at least on the first playthrough (let's ignore the implications of that), there would be no prior training data, meaning that the Solver, which does seem to be AI, has an advantage in having a database of player data and processing power.

Wdym, if there's no prior data of the player for it to work with how would it have a database?

And besides how would player data help the solver? If you're saying the solver can remember resets upon the soul user's death because it's a machine, that's not the case, since it's not a video game character it wouldn't be connected to any 'player data' and doesn't have any sort of 'meta' powers like the determination soul does, the best it would get is deja-vu and that's only after a few resets.

Idk, the Solver has probably watched Merg or Cibles at some point if it was trained similarly to ChatGPT. After all, it's just a bot on crack.

And besides, I would say the point of a soul being something intangible gives it an advantage, the solver being a program makes it vulnerable, it was created by a human, therefore it could possibly be destroyed by one, it's something that although complicated and out of control, still is tied to the physical world even with it's multiplying backups.

The odds may seem against a simple soul with energy, but it can retry all it wants, it may not replicate but it can't truly be destroyed without means that the solver will never have, whereas a program can be found with enough tech smarts and disabled.

But really if these two forces fought, the battle would likely go on forever

This is assuming that neither of them have outside knowledge of eachother, for all we know in the MD universe the internet might be completely lost, or undertale never existed.

Besides... knowing the soul's abilities won't help the solver at all if it doesn't have a way to prevent them

I will respond in a bit. I need sleep.

alr goodnight bro

I'd say determination