Or you could do that! 😅 Regardless, I would be interested in seeing just how much this guy can pump out. It looks like an insane amount of nova damage!
Along with what Gavin O. pointed out, I don't really see the point of having GWM. PAM already gives you a more reliable bonus attack, and with all of those smites and psychic damage, the -5/+10 isn't going to do a lot either.
I'd also like to point out that the only weapon that works for both...
Shadow Blade only has a range of Self. Plus, we're really only looking for things you can do by yourself.
But I have a really good idea.
Go Rogue 3, Arcane Trickster. Pick the Find Familiar spell. Your familiar can use the Help action every turn to give you advantage on one attack.
At Rogue...
Elven Accuracy only works with attacks that use DEX, INT, WIS, and CHA. Reckless Attack only works with attacks that use STR. And the whole build starts to fall apart without BOTH of those.
I say just go Half-Orc Fighter 4 or 5/ Barbarian 3 or 4/ then Fighter the rest of the way.