Beyond the Endless Deep Blue (Elgard Outpost)-堀諭史

https://www.bilibili.com/video/BV1hJHX6dE6s
The BGM for both the Ice Plains and Dawn's outposts are great, but I've been playing Dawn more recently, and since there's an official piano version available, I decided to transcribe this one first.
I haven't found any information about the arranger yet—feel free to share in the comments or via private message if you know who it is!