Title: Wings of the Bard OR Servant of the Goddess
Premise: Kass returns home, bringing a great evil with him.
Opening:
Link wakes up in the Hateno house bed, and goes over to the school where Zelda teaches about the Calamity and the Upheaval. Mid-lesson, Teba bursts through the door and tells Link that Amali's husband returned and is very sick. After a more-or-less mandatory horseback ride to Rito Village with Zelda, Link sees
Kass coated in the cyan-green spirit color of the sages of TotK that seems to be killing him. The green "goo" latches onto Link and transports him to the Great Spirit Island, a tutorial area that is the same shape as Lake Hylia but if it were the only island in a vast sea (very similar layout to Spirit Tracks' map). The Spirits of Good, specifically Anjean, first gives him a new inventory/quest gives him four new items at different Poe Shrines:
New Abilities:
the Hookshot (self-explanatory)
the Spirit Tracks (much like Ultrahand turned TotK into Nuts and Bolts, Spirit Tracks turns WotB into Mini Metro)
the Rod of Seasons (Wizzrobe powers basically)
and the Harp of Ages (the Harp of Ages sends Link to the past, when only Koroks and difficult monsters inhabit the world, Timeshift Stones can send other things into this past, there is also a very large evil fairy flying around in the past, so watch out)
First Part:
Anjean tells Link that the goo returning to Hyrule has awakened an ancient foreign evil, and that he must kill its source before it builds and destroys Hyrule.
Link uses the Harp of Ages to return to his body in the present, and decides not to kill Kass (there is an option to just kill Kass which gives a game over), when Zelda has the idea that they should ask the Great Deku Tree what the goo is. Link goes to get his paraglider from Kaneli.
Impa has been living in the Great Deku Tree as she's very near death. The Great Deku Tree and Impa counsel and encourage Link to seek out the Shards of Agony, hidden at the four Goddess Statues. Link tries to pull the Master Sword, but it becomes clear that he needs more spirit.
Link must enter dungeons hidden beneath the Goddess Statues to find the Shards of Agony
First Missions:
Akkala Mining Facility -- Kapson at Tarrey Town, under the Quarry Ruins and Spring of Power, the Gnarled Key found with the Gorons, Item: Double Clawshot (self explanatory), Miniboss: Fraaz and Blaaz, Boss: Spirit Twinrova
Lanayru Peak Ruins -- Robbie at Hateno Village, under Mount Lanayru and Spring of Wisdom, the Mermaid Key found in the ruins of Lanayru Promenade, Item: Zora Flippers (underwater exploration), Miniboss: River Zora, Boss: Spirit Thunderbird
Dragon Rock -- Garini at Lurelin Village, under Popla Foothills and Spring of Courage, the Dragon Key found in the Deya Village Ruins, Item: Timeshift Stones (sends other things into the past), Miniboss: Boss: a Spirit Zonai
Temple of Time -- Muava at Gerudo Town, under the Temple of Time, the Crown Key found at the North Gerudo Ruins renamed the Ancient Temple of Time, Item: Boat upgrade for the Spirit train, Miniboss: Spirit Darknut, Boss: Poe who uses Recall
After Link finds all of the Shards of Agony, he and Zelda return to Kass and expose him to the Shard of Agony: the goo that corrupts him recoils and floats out of him and forms into a female form:
Veran. Except her eyes look like those of Majora or Malladus' Zelda
She talks about how, after her master Ganon was so unceremoniously defeated in Labrynna, she sought to serve a new Demon King. She found that in "the Hyrule you abandoned," a Demon King worth worshipping. She thanks Kass for bringing her to Hyrule before floating into the sky above Lookout Landing (now Hyrule City), where she expels a massive explosion of goo, coating Riju, Tulin, Yunobo, Sidon, Impa and Zelda in goo, before floating towards the Zonai Temple of Time and disappearing into the past.
The big fairy in the past becomes coincidentally becomes much more aggressive every time you go into the past now.
Link and Kass go to Zelda and use the Shard of Agony on her. It pulls the goo out of her, but the goo burrows a hole into Zelda's Study in Hyrule Castle.
Link now must save his five friends, with the help of a ridable Kass (who now let's him access the sky islands, albeit with little stamina). Link travels to Goron City, Zora's Domain, Selmie's Spot (Tulin), Gerudo Town and a now monster-infested Korok Forest. There he uses the Shard of Agony on each friend, before the goo burrows into new dungeons, each of which have an entrance that uses the Terminian "falling through a dream" loading screen.
Second Mission:
Dodongo's Cavern - Save Yunobo, burrows in Gotram Cliffs hotsprings, Item: Ting Tong (bombs) Miniboss: Hot Head, Boss: Dodongo
Swamp Palace - Save Sidon, burrows in Mercay Island, Item: Frog's Song of Soul (recall and stasis) Miniboss: Helmethead, Boss: Morphshark
Ice Cavern - Save Tulin, burrows at Lake Kilsie, Item: Wind's Requiem (preserves Kass' stamina), Miniboss: Smog, Boss: Arrghus
Spectacle Rock - Save Riju, burrows in Spectacle Rock, Item: Oath to Order (muddlebud) Miniboss: Twinmold, Boss: Pigman (basically Z1 Ganon)
Great Palace - Save Impa, burrows into Mekar Island, Item: [Reverse] Song of Time (speeds up and slows down time), Miniboss: The Four Sword, Boss: Dark Link
At the end of each dungeon, you get (depending on order, in order): Fierce Deity Shield, Sword, Boots, Tunic, Mask.
Finale:
Now ready for battle, Link, Kass, Zelda, Yunobo, Sidon, Tulin, Riju, and Impa travel to the past, where they face down Veran. Depending on how many people you save and how many bosses you beat, Veran transforms into each of those forms (Dodongo, Morphshark, Arrghus, Pigman, and Dark Link). If you dare to fight Veran before doing
any dungeons, she'll be a crazy 22 phase boss (Twinrova, Thunderbird, Zonai, Poe included).
Much like Ganondorf, she will make as many copies as there are opponents. The Master Sword is strongest against this phase. Her second phase, she transforms into a Malladus-piglike form with beetle-ambiance. The Spirit Sword is strongest against this phase. Her third phase, her face transforms into Majora's Mask and she becomes much more erratic, spinning around Link. This fight is very difficult but the Fierce Deity is especially effective against this form.
After Link does enough damage, Majora-Veran starts absorbing all the goo from the world around her
into her, but Impa uses the Yiga teleportation technique and absorbs all of the goo, before she collapses in on herself and Spirit Vessel petals go flying everywhere. Veran, in shock, returns to the present, and the gang follows. This is a two-part fight: Veran starts by flying up as a fairy, where you must fly up with her as Kass and you have an on-Kass bow duel, aiming for her wings: once you clip her wings, she falls down. Then, Veran as a person rides a horse and Link rides his horse, Veran will purposefully try to kill your horse and, if she does, the Lord of the Mountain swoops in and you ride him around for a 1v1 sword duel on horseback all around Hyrule, you and her are riding all over the place, Zelda's riding behind you, Kass is flying behind you, slash, slash, slash, stab through chest, Zelda recalls her and traps her in time itselff with her sealing power.
A funeral for Impa if you collected all the memories.
Shrines:
After Link returns from the Great Spirit Island, the world is littered with Poe Shrines. Many shrines need specific souls to help gain access (meaning NPCs must be train-ed to the different locations after completing their quests). They grant Life Droplets, which now can be traded at Poe Havens for hearts, stamina, or spirit (which basically acts as magic for the train, rod, timeshift stones, abilities). The final reward is the Force Gem which Link places on the hilt of his Master Sword to make it the Spirit Sword.
Caves:
All the caves are still present, though now each serves as a Poe Haven, littered with poes. Each Poe Haven found adds more Poes to the caves, until they become gorgeous and full. Also used to unlock the map.
Sky Islands and the Yiga:
The sky initially seems barren, and the Yiga are much fewer on the surface (complaining about low recruitment since they lost last time yadayada). When Link goes to the Zonai Temple of Time for the first time, Master Kohga comes plummeting down in front of Link and immediately they start fighting. Link beats him, and Kass and him talk about hero's and villains and purpose, and Kohga realizes he's done fighting and resigns as the head of the Yiga Clan. The rest of the Sky Islands are populated with different Yiga members fighting over the title of leader and Link, with the disguise, can become leader of the clan and push them towards reform. This is the main thing going on in the Sky Islands, although maybe there can be a train upgrade that brings people up to the sky and they build a city up there, maybe not.
Map:
Still on the Purah Pad, Anjean adds Anjean's Application, which connects the map to Poe Havens.
There are two new maps: Kasuto Ocean off the east coast and Labrynna at the very east of the Kasuto Ocean. Labrynna is a one-for-one recreation of Labrynna but 3D.
Kasuto Ocean has 20 islands, each of which has a Misko treasure in it. The islands also have Stray Fairies, and the Fairy Queen on the central island asks for them. The fairies are used for armor upgrades, the Great Fairies are now used for repairing weapons and they've moved to the peaks (Hebra Peak, Gerudo Summit, Tal Tal Peak, Mount Floria). There are Sea Seals that can be ridden besides boats.
Kilton and Kotlin are visiting their father Dampe in Labrynna, Labrynna is covered in goo. Dampe is looking for masks, Kilton is compiling a compendium of all monsters (and basically acts as Archivist Toadette), Kotlin as a Blupee bounces around Labrynna and drops a golden rupee when you find him. To clear the Labrynnan goo, Link must complete all the local sidequests and get the 20 masks, each acting as an entire armor set stat boost (heat resist, cold resist, ancient proficiency etc.) Give Dampe all the masks and he says that he hopes his friend will visit soon, a secret path in the Lost Woods leads to the Happy Mask Salesman who can be train-ed, then boat-ed to Labrynna. Give the Happy Mask Salesman all the masks, and he will allow Link to enter the Hero's Realm where Link can talk with past incarnations of the hero and gain new weapons abilities (Downward Thrust, Four Sword, Boomerang, Great Sword Spin etc.)
Dragons:
They are way up in the sky, you need Kass to reach them.
Memories:
Impa's memories of all her different lives are marked by riddles she gives you. Skyward Sword, Ocarina of Time, Wind Waker, Oracles, ALBW, Z1, that one time her name was Impaz. Very much side content, the reward is the Spirit Bridle and Spirit Saddle which lets you permanently tame the Lord of the Mountain.
New Items:
Spirit Vessel - new flower (like Silent Princess and Sundelion)
Bandoneon - Kass gives you a bandoneon and when you play music, NPCs and monsters alike dance. Also used for the songs.