The requirements in order to summon Phosphora's Spirit.
Summon is an option within the Collection tab of the Spirits single-player mode that allows players to summon certain spirits with cores obtained by sending spirits home in the Dismiss menu. Some spirits are only obtainable through this method, meaning the only way to collect the total number of spirits is to summon some of them. Previously summoned spirits may later appear on the Spirit Board, and others can be encountered in World of Light without needing to summon them first. There are 133 summonable spirits and 91 of them are summon-exclusive.
How to Use
Each spirit has a certain amount of cores and SP required in order to summon it. Often, the type of cores needs to be specifically from a certain spirit. For example, summoning a Paper Mario spirit consumes a Cut Man spirit and Cardboard Box spirit, along with any Neutral type spirit.
The player may also directly use spirits in summoning, rather than dismissing them first and then summoning. The game will automatically dismiss the chosen spirits (gaining SP for the dismissal) and use those cores for summoning.
List of spirits that can be summoned
Below is a list of spirits that can be summoned within this menu, listed by spirit number, along with the cost of SP and cores for each summon, and if they’re summon-exclusive or not.
Gold Mario and the required summoning cores are all individual power-ups from the Mario series.
Gold Mario and Metal Mario are both different metal power-up forms of Mario.
Gold Mario can throw fireballs similar to Fire Mario's fireballs. Also, Gold Mario can be obtained with the Gold Flower, which highly resembles the Fire Flower.
The required summoning cores likely references a real-life means of making Paper Mario: scissors used for cutting (Cut Man, who has a giant pair of scissors on his head) and the material to cut (a Cardboard Box).
Fierce Deity Link and Deku Link are both mask transformations used by Link.
Fierce Deity Link and Kirby (featured in the Ultra Sword spirit's artwork) both wield giant, powerful swords.
Fierce Deity Link, Deku Link, and the Happy Mask Salesman all appear in The Legend of Zelda: Majora's Mask. Also, the Happy Mask Salesman has a strong connection to the masks that Link uses (both in acquiring and personally).
The Attack type core likely references Fierce Deity Link's enhanced power using his sword.
Tingle and Balloon Fighter both fly on a balloon in a similar fashion, with Tingle starring in a remake of Balloon Fight titled Tingle's Balloon Fight DS.
Tingle claims to be a reincarnated fairy, represented by the Fairy Bottle. Also, both characters appear in The Legend of Zelda series.
The required summoning cores references Demise being the true form of his sealed form, The Imprisoned after he was released by his servant and sentient weapon, Ghirahim.
Daroach and Count Cannoli are both thief characters wearing a top hat and a cape.
Daroach and Mouser are both mouse characters. Also, Daroach is the leader of the Squeaks, a band of rogue mice, similar to Mouser being a rogue mouse character.
The two Neutral type cores likely references Daroach becoming a helper to Kirby in Kirby Mass Attack after turning into Dark Daroach in Kirby: Squeak Squad.
Slippy Toad and Lin both share a similar profession of engineer.
Slippy Toad and Winky are both amphibian characters, with Slippy being a toad and Winky being a frog.
The support core likely references Slippy Toad aiding the Star Fox Team in their adventures. The support core also likely references the Arwing, a support spirit invented by Slippy.
The required summoning core references Ephraim being the twin brother of Eirika (a twin brother-and-sister relationship represented by Frey & Freya, both twin brother and sister).
Chef (Game & Watch) and Chef (Personal Trainer: Cooking) are both professional chefs.
Huey being made of paper and able to absorb black ink represents Chef's flat and black design, a theme common in the Game & Watch series. Also, Huey's game of origin, Paper Mario: Color Splash, also features a mini-boss fight against a 3D steak when Mario substitutes for a chef.
Pit (Original) and the required summoning cores are all bow-wielding Cupid characters. Also, Pit (Original) and the Centurion are both characters that appear in the Kid Icarus series.
Twinbellows, Rusty Slugger, and Inuji Darumeshi, are all dog characters. Also, Rusty Slugger and Inuji Darumeshi are regional counterparts to each other, likely representing the twin heads of Twinbellows.
Twinbellows and Hothead are both characters whose bodies are completely made of fire.
The required summoning cores references Hewdraw being a serpentine, long-necked dragon character.
The combination of the required summoning cores would create three heads, referencing Hewdraws three heads with each head having different personalities/motives like Hewdraw.
The Reaper & Reapettes and the required summoning cores all share a "Grim Reaper" theme, with Death representing the Reaper, and the Grim Leecher representing the Reapettes.
The required summoning cores references the Eggplant Wizard being a sentient eggplant who wields a magic staff, which turns his victims to walking eggplants.
Gray Fox and Mighty Gazelle are cyborgs wo were reconstructed humans after a near-fatal explosion, with Gray Fox landing on a landmine and Mighty Gazelle from a crash.
Gray Fox and Shadow Man are both stealthy ninja characters.
The required summoning cores references Raiden being the adopted son of Solidus Snake, and being the husband of Rosemary.
The Neutral type core likely references Rosemary's personal stance when she was initially used to spy on Raiden before falling in love with him instead.
Metal Gear REX is a Meta Gear developed by the chief engineer, Hal Emmerich.
Metal Gear REX and Tank & Infantry are both associated with the military, as Metal Gear REX was developed for usage in the United States Army in the Metal Gear series.
Jet and Akari Hayami are both competitive characters who uses a board in their respective games, with Jet using a hoverboard and Akari using a snowboard.
Tom Nook and the required summoning cores references all characters working for their respective shops.
Tom Nook and the Maruhige Shop Owner are both shop-owners.
Tom Nook hires the player to work for him in Animal Crossing, represented by the Shop Assistant.
The Neutral core likely references Tom Nook's role in the Animal Crossing series, agreeing to build and expand the player's house but also sending the player further into debt each time.
Resetti and Mettaur are both hard hat-wearing characters.
Restti, Dugtrio, and Muddy Mole are all characters who specializes in burrowing underground.
The two Attack type cores likely references the multiple number of times a player must reset within the Animal Crossing games in order to make Resetti angry.
E. Honda and the Sumo Brothers are all characters who specializes in sumo wrestling.
E. Honda and Piston Hondo both share a surname, as Piston Hondo was originally named Piston Honda in the original Punch-Out!! game. Additionally, both characters appear in a fighting game series.
Madama Butterfly is bound to Bayonetta, referencing both Beyonetta and Shanoa being witch characters who summons fists and blades to augment their attacks.
Madama Butterfly is a member of the Infernal Demons, a race of demons who, like the Aparoids, features insectoid designs.
The Neutral type core references the angels and demons in the Bayonetta series not following the good and evil themes they traditionally represent.
The Support core references Madama Butterfly lending her power into Bayonetta's attacks.
The Squid Sisters and Blooper are all squid characters.
The Squid Sisters and Meloetta (in its Aria Forme) are all female characters who specializes in singing.
The Squid Sisters and the Ouendan Cheerleaders are both groups of people who are associated with cheering, as the Squid Sisters cheer for the Inklings during SplatFest.
The required summoning cores references Master Core being the secret final boss at the end of the Classic Mode in Super Smash Bros. for Nintendo 3DS/Wii U who takes the form of Master Giant, Master Beast, and Master Edges on an intensity of 5.0 or higher.
Boss Galaga and the required summoning cores all share a "stealing" theme, as Boss Galaga steals the player's ship, the Swooping Snitchbug steals the player's Pikmin, and the Bandit steals coins or Baby Mario (in Yoshi's Island).
Trivia
The Absolutely Safe Capsule is the only summonable spirit that requires a summonable spirit (Mr. Saturn) to summon it.
Ribbon Girl and Ninjara are the first summon-exclusive spirits to gain spirit battles in an update.
These spirit battles are only accessible in the ARMSDLC Spirit Board.
The Poppi α is the only summonable spirit that can be purchased.