I don't know if you'll knock this in with Grizzleheim's Viking/Norse...even though Vikings are Icelandic... And never had horned helms.... And I don't know if you'll knock it in Aquila being Greek, since the first person you think... Is a God... But the world is the Norse home world of the God of Lighting, Thor... Valhalla! I can kinda picture the "Commons area" being the rainbow bridge, the spiral door is guarded by Hemdial, who towards the lvl 8 of the world have you approach Yggdrasil the world tree as you prepare for the Ragnarok... (Kinda a low-key Loki nerd)
Also kinda like sword of kings from Avalon... Mjölnir could be a possibility?