Ragnarök
Ragnarök (also known as the Twilight of the Gods, Doomsday or Götterdämmerung) is a series of future events, including the occurrence of various natural disasters, a great battle foretold to ultimately kill many deities (including the Gods @Odin Borson, @Thor Odinson, @Tyr, @Freyr, @Heimdall, and @Loki Laufeyson), the burning and drowning of the Nine Realms, and the rebirth of life in the paradise of Gimlé.
Ragnarök was first prophesied by the @Jotunn Seeress Gróa, who unintentionally saw a vision of the actual events while searching in her library for ancient tomes for knowledge that would help her find her lost husband Aurvandil. In her vision she saw the beginning of Fimbulwinter, Sköll and Hati devouring the Sun and Moon, @Surtr emerging from @Muspelheim, Hróðvitnir breaking free from his chain and the Gods once again at each other's throats. However, her vision was so powerful that it was felt by Odin himself, who promptly journeyed to Gróa's library to demand what she had seen. Seeing that the seeress was hesitant to tell him anything, Odin proceeded to strangle her, but not before coldly revealing that Thor had killed her husband long ago.
However, Gróa managed to have the last laugh as the All-Father was seemingly unable to take all of her knowledge regarding the events of Ragnarök and only learned some of the main figures to be involved. He continued to try and gather more knowledge surrounding the events. Knowing that the rest of the Jötnar also possessed the gift of foresight as well, he manipulated his son Tyr into arranging a meeting with the Giants in their home realm of @Jötunheim in order to try and steal some of their secret knowledge on the events of Ragnarök. Under the guise of brokering peace between the two races, Odin managed to gain entrance to the realm of the Giants and proceeded with Tyr to the meeting hall. However, his treachery was quickly discovered, and the Giants forever banished him from Jötunheim before he could learn anymore.
Order of Ragnarök's Events
@Níðhögg shall chew through the roots of Yggdrasil, leaving the tree to yellow and sicken as the worlds it supports shall plunge into chaos.
Fimbulvinter ("Mighty Winter") - three consecutive winters during which the entire Midgard shall freeze, and all life will cease to exist. The only two human survivors, Líf and Lífþrasir, will hide in the branches of Yggdrasil.
Sons of @Fenris - Skoll and Hati - responsible for chasing the Sun and Moon to eat, will finally reach their targets. Sól and Mani, the gods of the Sun and Moon, will die along with the stars and sky.
Three Roosters shall hatch and crow to announce the beginning of the battle: Gullinkambi in Valhalla, Asgard awakening the gods and einherjar; Fialar in the forest of Gálgviðr in Jotunheim awakening the Jotnar; and an unnamed soot-red rooster (named "Nameless" by Odin) in the halls of the underworld location of @Helheim. The cheerful Jotunn herdsman, Eggther, will play his harp on a mound.
@Garm, @Hel's watchdog of the Underworld, shall roar. At this time, the bindings of Loki and his son, Fenris Wolf, shall come loose.
@Loki Laufeyson and @Fenris shall exact their revenge. The Midgard Serpent will emerge from the waters to join it's brother Fenris as they advance on the Gods, and Loki, with his giants and allied monsters, will sail the rising waters wiped into a frenzy by Jormungand on Naglfar - the Ship of Nails - steered by Hrym, towards Asgard. The sky will split in two, and Surt and his army of Fire Giants will come through and ride across the Bifrost Bridge, which shall collapse under the weights of all those monsters and giants.
The armies of both Loki and Surt will advance to the field of Vigridr for the final battle. They shall be joined by the armies of @Helheim, headed by Hel herself, who comes to aid her father against the Gods, as well as @Jörmungandr and Fenris Wolf, who, like their sister, join the fight against the Gods. Nidhogg shall also rise from the underworld to bare the souls of deceased criminals to Loki's aid.
Seeing the enemies, @Heimdall shall blow his warning horn - @Gjallar Horn - so loud, all Nine Realms will hear it. Odin shall lead his einherjar out of Valhalla and into the battle. The warriors of @Folkvanger shall flip Sessrumnir over and sail to the battle, where they to shall assemble.
Hresvelgr, the Sallower of Corpses, shall deliver the screams prophesised to signal the Twilight of the Gods and at these cries, the fray ensures.
The All-Father and his spear @Gungnir will be swallowed whole by Fenris, but his son - Vidar - who has been mourning the fallen Baldur - will hear Odin's dying cries and join the fight. The son will avenge the father by ripping the wolf's mouth apart with his giant boot. Odin's wife, Frigg, shall cry for the only second time in her life.
Thor shall slay @Jörmungandr with his hammer in a final confrontation but will fall victim to the serpent's venom sprayed on him after taking nine steps.
Loki and Heimdall will kill each other in a duel.
Amid the chaos, @Garm shall charge Tyr on Hel's command and grasp the God of War in his fangs, tearing his chest open, but Tyr will kill him with his final act.
When the gods are dead, the einherjar will fight the giants and monsters until the very end.
@Surtr will kill the god @Freyr using the latter's sword, @Sumarbrander, and incinerates the Nine Realms with his full power, destroying everything in the process, himself included.
After burning @Asgard, the oceans shall rise and engulf the Nine Realms in water. Yggdrasil, the World Tree, will be destroyed by water. From Yggdrasil's roots, a new world - called Gimlé, the New Asgard - shall emerge.
Líf and Lífþrasir will repopulate Gimlé. Hel resurrects Balder and Hod, and they reconcile in the new world, which Vidar shall rule.
Nidhogg shall also survive and return to his duties as tormentor of the spirits of the wicked. He shall be the darkness that balances out the good.
Gimle will be a peaceful place with no strife. The population of humans will live in peace, prosperity, and happiness.