Artemis ARENA

I would suggest adjusting the build to be a bit more standard. Some of the itemization isn't optimal.

While you can still do good damage overall with that first build (Critical), it's lacking in a bit more % pen, and overcapping on crit chance. Rage shouldn't be there at the bare minimum, and Silverbranch Bow is a good replacement. Art's AS steroid allows her to get good use out of Silver's passive, and solves the lack of % pen, while you still keep 90% crit chance, which is more than enough.

The Pen/Crit build also needs work. While this one does have good % pen, it's using Titan's Bane...and I just don't get why Silver wouldn't be chosen here. If this was Neith and you were going for a power/pen/ability build, TB would be fine, but Art is a basic attacker.

And again, Rage should be replaced. 3 crit items is plenty and the others are going to be better for her kit compared to Rage. And you shouldn't be building Rage last IF you do get it.

As for skill leveling, it's also a bit messed up and not the order I'd recommend. Ult can be leveled at 5, 9, 13, 17, and 20, so they messed that up a bit. As for skill prioritization, you're not going to be doing that much damage until you've got multiple items online. At the start, Suppress The Insolent should be prioritized, and probably maxed by level 10. It's by far the safest for her, and allows for easy poke. Then you focus on Vengeful Assault after that, when some of your items are getting online and you can do a bit more dmg with your basics.