You can probably get a computer that can run Arelith for well below $1500! Usually, when it comes to gaming, the important bits are the CPU, the graphics card (GPU), and the RAM.
There's a couple of sites that let you configure the setup you want, but they require a bit of technical know-how. I have not done computer/computer parts shopping for a long while, so I'm kind of out of date on what's good these days. This one seems like it woudl fit the bill.
https://www.ibuypower.com/store/rdy-trace-7mp-003
This one caught my eye as it has a pretty good special going on right now. The GPU is solid, there's a good amount of RAM (I wouldn't do anything below 16 GB if you're going to be gaming), and the CPU seems to have decent reviews.
(I might be talking nonsense as the last time I did any computer upgrades was before COVID, if this is the case, someone please correct me xD)