Forum:Marvel's Thor and Ragnarök Online Expansion/@comment-ZeroTigress-20141122235838

World Access:

Alfheim -> Svartalfaheim

Because Dwarves are also known as dark elves, I speculate that access to the dwarven realm of Svartalfaheim would be from Alfheim. (Also in Norse mythos, Alfheim is considered the opposite of Svartalfaheim.) Perhaps have players unlock access to a special gate that once connected Alfheim and Svartalfaheim but was shut closed due to some drama between the Elves and the Dwarves.

Jotunheim -> Vanaheim & Asgard

Jotunheim is considered the opposite of Vanaheim in Norse mythos so it stands to reason that access to the godly realms of Vanaheim & Asgard would be done from Jotunheim. Perhaps a revelation access quest involving Loki would unlock a portal to Vanaheim and Asgard. (That'd be pretty fascinating.)

Niflheim/Hel -> Muspelheim

Again, in Norse mythos, Niflheim is the opposition to Muspelheim. It also makes sense in RO's lore since Muspelheim is the home of demons while Niflheim is home to witches. Perhaps have an access quest where you help Kirkena reach Muspelheim to settle a dispute with a demon or something. Or maybe a backstory quest about Baphomet or Tartanos, the demonic sword of Sakray!

Yggdrasil Tree -> All 9 Worlds

Of course, accessing Yggdrasil would enable players to reach any of the 9 worlds without having to travel through the other worlds. But that kind of quick and easy access should come at a price. A rather HEFTY price. Here's my proposal for how players would be able to access the world tree:

In each world, players may stumble across a randomly spawned Yggdrasil Plant. Harvesting these plants from each world would yield that particular world's Bark (i.e. Yggdrasil Plants in Midgard would only give Midgard Bark, Yggdrasil Plants in Alfheim would only give Alfheim Bark, etc.). The bark would have a 0.001% chance of dropping and collecting one of each world bark (Midgard Bark, Niflheim Bark, Muspelheim Bark, Alfheim Bark, Svartalfaheim Bark, Jotunheim Bark, Vanaheim Bark, and Asgard Bark) would be required in order to access the Yggdrasil Tree. (The Hel Bark can only be given out by Lady Hel herself, which would be a separate quest.)

Once players have collected one of each bark, they must go to Hvergelmir's Fountain (the area that is accessible from Umbala and Nifleheim's field) and seek out a special waterfall which will cultivate all 9 barks into a Branch of Yggdrasil (character-bound). This item would work like the Eden Group warp badge in that it can be used without being consumed. However, players can only use the Branch of Yggdrasil at Hvergelmir's Fountain. Using the branch would instantly warp the player to one of the 9 worlds.