Chapter 13: The Beginning of a New War
It is two months later and most of the Fighters of Lapis have disbanded, now that the threat of Tabuu and the Brotherhood is no more. Mario, Homura, Robin, Chrom, Iron Man, and Wii Fit Trainer now make up the Fighters of Lapis, taking on smaller villains. Mario still has not seen either Luigi or Batman since their disappearance, but Homura assures him it's fine.
Iron Man states that they could probably just use his Ultron idea, but Homura is very much against it after seeing Madoka die so many times in front of her eyes. And so they just wait, waiting for the new big villain to come. But they never come.
Then one day, during a fight with Risky Boots, it does. Strange creatures called Risen begin to appear, and they don't seem to disappear after the fight. Mario calls up Tails to investigate these Risen, and Tails joins the Fighters of Lapis as a researcher, with Sonic tagging along again. They head to a forest, where the Risen seem to be appearing.
Chapter 14: Smokey is Probably Pissed
Mario and the Fighters of Lapis camp out in the forest, where Wii Fit Trainer teaches them meditative poses to pass the time. They fall asleep, but Chrom wakes up once his "Chrom-senses" tingle. Homura follows him, believing he may be onto something. It turns out to be nothing, but then the ground shakes and lava erupts, setting the forest on fire. Homura looks as a time gate opens, with Risen spewing out. Chrom fights off the Risen, but soon gets overwhelmed, and so does Homura, who can't reverse back time as the Risen have her in a dead lock. Suddenly, a mysterious stranger appears out from the portal, who looks like Marth but with a mask.
"Marth" slays the Risen and helps out Homura, with her assisting Chrom. She vanishes after helping them, running off to who knows where. The Fighters of Lapis fight off the Risen that have appeared in the forest, and begin to call up a bunch of old members to find out where the Risen came from and how to stop them.
Chapter 15: Tournament Battle
The Fighters of Lapis decide they need more allies to take out the Risen threat, so they head to Candy Kingdom for help. Princess Bubblegum and Doronjo are battling over the throne, with Doronjo only agreeing to not kill Princess Bubblegum if they agree on the terms that if they win, Princess Bubblegum is still ruler, but if Doronjo's team wins then they get the throne. Even though the Fighters of Lapis could just easily defeat Doronjo, her team seems to be pretty tough, consisting of "Marth", Y.V, Fella, Gold Lightan, Azrael, and Axiadin. Chrom only agrees to see if he can get more information about this "Marth" fella.
After a long battle, it is revealed that "Marth" has some kind of "Falchion" of sorts, incredibly similar to Chrom's, but not quite. She appears to know his moves though. The Fighters of Lapis win and Doronjo is banished. Princess Bubblegum and her Gumball Guardians join the Fighters of Lapis.
Chapter 16: La Manana
All seems to be going well, with plenty of members returning to the Fighters of Lapis. With the exception of "Marth", most of Doronjo's team joined them and Finn, Jake, Marceline, Mordecai, Rigby, Touko, Fennel, Mai Shiranui, Bonne Jenet, Blue Mary, Princess Athena, Luise Meyrink, Terry and Andy Bogard, Bat & Visor, Tsuyu Asui, Momo Yaoyorozu, Knuckles, Peach, Daisy, and Miku Hatsune all joining the fight.
They learn that a girl named Noodle is under threat of assassination, and they head to Windmill Island which is currently floating over a desert in Plegia. Plegian soldiers begin attacking them, mainly because of Chrom. After attacking the Plegian soldiers, they find one that's not like the others named Tharja, who is in love with Robin.
Jet planes begin circling the Windmill Island, and Bonne Jenet uses a anchor to get everyone up there. The Fighters of Lapis fight off a bunch of soldiers that are led by a man named the Boogeyman. As they get close, the Boogeyman vanishes. Suddenly a explosion is lobbed at the island and everyone falls off. Mario for a second begins to believe Noodle is dead, before Jake reveals that he saved her. Noodle joins the team.
Chapter 17: Who?
Noodle attempts to contact her former band mates, but all that she can get out of all the numerous phone calls is that they're on a place called Plastic Beach. Homura urges that they build up more forces, with Mario and Chrom stepping outside to talk. Mario believes that Homura is becoming too controlling, and that they need to find out more about these Risen forces before gathering such a large army. Chrom states it's likely that she's just trying to take the leadership role for her own. Mario disagrees, stating there must be something else. They get two more recruitment: Pit and Palutena.
Just then, they notice "Marth" watching from the bushes. "Marth" appears and tells them that an attempt at Wario's life will be made at his castle. As "Marth" leaves, Palutena admits that "Marth" is pretty good looking, which causes Pit to gargle a bunch of words.
They head to Wario's castle, where they find a ship has found itself on top of it. They head inside, to find that bunch of space pirates of sorts have infiltrated Wario's castle. The leader of the space pirates introduces himself as Starlord, leader of the Guardians of the Galaxy, which leads Pit to ask "Who?"
Although the two parties battle, Chrom and Drax begin to relate to each other, which makes them question their motives. The Guardians of the Galaxy and the Fighters of Lapis stop fighting and become allies, with the Guardians stating they just wanted the Tesseract from Wario's collection of priceless artifacts, as it's a Infinity Stone. Wario, Starlord, Drax, Gamora, Rocket Racoon, and Groot join the Fighters of Lapis, although the addition of the Infinity Stones confuzzles them a bit. Is someone after them?
Chapter 18: Before My Body is Dry
The Fighters of Lapis learn that another infinity stone is located at Honnōji Academy. As they head there, they find that some Grimleal forces have already arrived and they are planning to assassinate Emmeryn with trophy annihilators. Emmeryn is over there for a visit with Satsuki and Ryuko. Chrom attempts to rescue his sister, but is stopped by Aversa.
After defeating Aversa, they head inside the academy, teaming up with Ryuko and Satsuki. There they fight off some of the Grimleal invading inside. As they stop the Grimleal from assassinating Emmeryn, Validar appears and takes her hostage, planning to execute her at Plegia Castle. As Chrom and Robin plan a rescue, Mako wakes up and asks what just happened.
Chapter 19: Mountainhead
Robin decides that they need to stick to a smaller group initially, and then get a west and east group to come in later. Mario, Homura, Robin, and Chrom form the first group, while Wii Fit Trainer, Noodle, Ryuko, Mako, Pit, Palutena form the east group while Satsuki forms the north group with Wario, Starlord, Bat & Visor, Gamora, Rocket Racoon and Groot.
The four appear at the Plegia Castle, which is a sandy place. Tharja unexpectedly sneaks along the four, but they suppose it's alright. The five appear just as a Grimleal solider is about to swing his axe, however he is shot down from Homura's gun. The east and west armies suddenly appear and Rocket Racoon grabs Emmeryn to safety and begins blasting away.
After a long battle with the Grimleal, Ganondorf appears with Jhudhora. As the Fighters of Lapis tell them they are surrounded, Risen appear. Just then, Cordelia and Sumia appear and take out the Risen. Ganondorf and Jhudhora disappear, with Primids joining the Risen.
Suddenly Validar appears, with a entire Grimleal army surrounding all of them. Rocket Racoon is knocked off the cliff but is saved by Groot. Emmeryn is at the hands of the enemy again. Validar tells Chrom to either give of the Fire Emblem or give up his sister. Chrom has to make a difficult choice, but it doesn't matter anyway becuase as he thinks, Emmeryn jumps off and dies, the fall being too great.
Chrom becomes so mad that he takes out the entire Grimleal army by himself and Validar, Ganondorf, and Jhudora suddenly decide to run into the outlands. But Chrom is not done.
Chapter 20: Revenge in the Plegia Graveyards
Chrom runs after the three villains into the graveyard. Robin, Mario, Wii Fit Trainer and Homura join up. Mario asks Homura if it's possible to just reverse time and prevent that from happening, but Homura says that it was a fixed event that she can't tamper with otherwise worse things will happen.
You play as Chrom only in this level, hacking through tons of bad guys. You must quench Chrom's bloodthirst and then the first part of the level is finished. The second part of the level is a boss fight with Validar. After defeating Validar, the trophy fades into darkness. Chrom calms down as Robin helps him to the Fighters of Lapis base.