It's some kind of a giant bridge with a guardian. The guardian had been there so long she forgot her purpose and sealed her confusion and fear. A fog developed and enshrouded the bridge. Like a moth to a flame, and curiosity worse than a cat's, adventurers sought to enter the fog, only never to return.

https://renewal.playragnarok.com/news/updatedetail.aspx?id=185

https://renewal.playragnarok.com/news/updatedetail.aspx?id=186

For now please see this entry for a list of quests associated with Bifrost.
https://renewal.playragnarok.com/news/updatedetail.aspx?id=187

https://renewal.playragnarok.com/news/updatedetail.aspx?id=195

Hazy Forest

Episodes

• Episode Skip Tickets  • 12 Nightmare of Midgard, Satan Morroc  • 13.1 Ash Vacuum • 13.2 Encounter with the Unknown • 13.3 El Discastes  • 14.1 Bifrost • 14.2 Eclage • 14.3 Decisive Battle  • 15.1 To Phantasmagorika! • 15.2 Memory Record  • 16.1 The Royal Banquet • 16.2 Terra Gloria  • 17.1 Illusion • 17.2 Legacy of the Wise One  • 18 Direction of Prayer  • 19 Issgard, Land of Snow Flowers  • 20 Undying

Countries & Towns of Ragnarok Online
Rune-Midgarts Kingdom	Prontera • Izlude • Alberta • Payon • Archer Village • Morroc (Destroyed) • Geffen • Al De Baran • Comodo • Umbala
Republic of Schwartzvald	Juno • Einbroch • Einbech • Hugel • Lighthalzen • Verus
Arunafeltz States	Rachel • Veins
New World	Rune Midgard Allied Forces Post • Manuk • Splendide • El Dicastes • Mora Village • Eclage
Standalone	Lutie • Jawaii • Nifflheim • Malangdo • Dimensional Gap • Lasagna
Global Project	Amatsu • Kunlun • Louyang • Ayothaya • Moscovia • Brasilis • Dewata • Port Malaya • Rock Ridge