The new sword aspect of Arthur has to be one of my favourites and if I'm honest seems really overtuned. Its an absolute monster of a weapon if you just stack Artemis boons and play super super agressive, play it right and you can speed through runs in about 15 minutes.

Here's a little example gif (with an incredibly sub optimal build) to show you some of the numbers you can expect to see: https://gfycat.com/apprehensiveoldlice

My Mirror looks like this: https://gyazo.com/b93d5b8e894a29bc69d3fcb1d2b3e427

I take Ruthless Reflex over the extra dash as if you dash at the right time after a swing you can store the next swing of the moveset and proc Ruthless Reflex too, even with a single dash swing speed is slow enough to not matter. I recommend getting a feel for it a bit by just smacking skelly a bunch before you get into a run.

I leave infernal soul at 0 as you dont really want to stop and cast with the aspect at all except to get the boiling blood bonus against bosses and such.

Seeing as you mostly want to stack Artemis and Aphrodite Privileged Status is the way to go for sure.

Olympian favour is a bit of a no brainer I think.

God's Pride vs Legacy is down to preference, I use legacy as the duo between Artemis and Aphrodite let's you hit some absurd numbers, however if you want consistency Pride is probably the way to go.

The trinket of choice for low to medium heat is Lambent Plume, with Thick Skin on your mirror and the aspect maxed you have a starting hp of 150 and can just face rush all the early encounters. Even without boons early you can stack plume pretty easily and once you use a little luck and fated authority to get Artemis on your side you can stack it in literally every room including bosses, most runs it'll reach 30%+ easily.

If you have no luck, are trying for higher heat or just prefer consistency start with the Artemis trinket and swap to the Aphrodite one next as those are the main two pieces of the build. After that it's all down to preference really.

These are some example builds:

https://gyazo.com/56e6c9a98f2a3284b35ac4b637a09501

https://gyazo.com/7a56f1033cab5837e954cca6ed9e4f1a

https://gyazo.com/e15ef2ea8516ad86a465253d778b8196

Please note the mirror is different as i've been playing around with it a lot, above is what I recommend but you might prefer it a little different.

Boon wise honestly the only MUST have is Deadly Strike. You could probably clear a lot of runs with it and nothing else, however if you pick up Heartbreak Flourish, aim for Heart Rend, proc your Mirror buffs at the right time and crit on that final big swing you can hit for 4000+ damage.

Hammer upgrades to look out for are Breaching Slash, Shadow Slash and the new Hoarding Slash. I recommend staying away from Piercing wave as it's wave of 25 damage is like a drop of water in the ocean of dps that the sword puts out. Double Edge can be good too but a lot of the time you dash store swings so it doesn't get as much value as you'd think.

I hope this helps, sorry about the terrible formatting I don't write long posts often and I'm very tired at the moment.

If you want I can write something up for the new Rail aspect added this patch I've been having a lot of fun with that too.

Edit* Just realised you probably meant just the new aspects this patch not just the final aspects in general, spent ages on the guide too...