Apparently arenascape.net has returned. I don't believe Silverion brought the game back though, because you are unable to create any new accounts and if you input a fake user/email/password, it will say "Thank you for your message. It has been sent."
I suspect that whoever bought out the arenascape.net domain is trying to get players' password information. On top of that, they have a two blogs full of gibberish, probably with key words in an attempt to drive traffic to the site. Also, keep in mind, the Copyright info was also changed to 2023 so it's actively being worked on...
Just a warning for anyone that used to play ARENAscape and is trying to come back to that game!