I know Celestial Spirit magic is a holder magic and without keys it's meant to be kinda useless and Urano Metria is unclassified and might not be one of the spells in this category, but I think celestial wizards should have a few spells to be able to hold their own during all the times their spirits decide to be garbage. And obviously Lucy and Yukino don't care enough to have their spirits teach them water or gravity magic even though magic can be taught to you. These spells can be learned with the help of most spirits or wizards that are extremely knowledgeable when it comes to magic or bestowed upon you by the Celestial Spirit King or Queen. Some require keys to perform but others are caster-type spells.
Spells
Wish:
Taught by: The Celestial Spirit King or Queen gives it to you. Almost like fairy glitter.
Effect-The caster has to recite a wish of what they want to happen. Then they call upon the power of a spirit that can make that happen. If no spirits can do it, nothing happens. Each spirit can only give their power once so there are a limited number of uses. For example, if you wished to be stronger you might use the power of Taurus or if you wished for a fire to keep you warm you might use the power of Phoenix. This is constantly active so you have to be careful as if you had a genie and you have to be specific because if you wish to attack everyone around you, you could hit allies.
Starcall:
Taught by: Any spirit that's very knowledgeable about Celestial Spirit magic.
Effect: The user summons a small star that drops down on an area, causing a big explosion. It can call down more than one, but that's much more draining. Any spirits with a star or stellar or celestial slayer magic can consume these stars to gain more power.
Stellar Shot:
Taught by: Knowledgeable spirits.
Effect: Fires a blast that burns through most things.
Sky's Wrath:
Taught by: Spirits who have destructive capabilities.
Effect: While holding a key, golden stars forming their constellation appear in the air and rain down the destructive potential of their magic. This is very draining on the spirit so spirits don't appreciate it being used too often. As an example, Loke would produce searing, bright light that burns an area. Long the dragon would produce a storm with a bunch of lightning strikes. Caelum would produce a gigantic blast. Vulpecula would create a meteor of fire. Jupiter would create a tornado of poison.
Star's Arms:
Taught by: Knowledgeable spirits.
Effect: Borrows a weapon from a spirit whose key you own. So Lucy could summon a bow, chains, scissors, maybe Leo's rings, an axe, and I'm not sure about the urn. Yukino could summon Son Pisces's trident with its water magic. It just lets you summon a weapon from the spirit world but it can only be used for spirits you have contracts with. It's best used in conjunction with star dress.
Lashing Glow:
Taught by: Spirits with stellar or star-themed magic.
Effect: Turns your arm temporarily into an extendable, glowing whip of light. Anyone that can skillfully use a whip can use this so that they don't have to rely on a weapon that can get lost as long as they don't mind using a little extra magic power to sustain it.
Astroburst:
Taught by: Spirits with star-themed magic or with a lot of knowledge.
Effect: Unleashes all of the user's magic power in an explosion of stardust that grows in destructive potential based on the user's magic power. It leaves the user at death's door whenever it's used so it's not wise to rely on it because one day you might not recover from it.
Shining/Night Armor:
Taught by: The Celestial Spirit King or Queen.
Effect: It lets you borrow a fraction of the Celestial Spirit King or Queen's power temporarily similarly to star dress. It's only allowed to be used in emergencies and misuse will result in it getting taken away. It's extremely rare and powerful, giving you either the purifying light of the King that lets you defeat evil enemies easily or the suppressing darkness of the Queen that dampens the power of your enemies. It also gives you a weakened version of their armor and weapons so you can get the sword or the bow depending on who gives you the power.
Eclipse:
Taught by: Knowledgeable spirits.
Effect: Makes you invisible so long as you stay in shadow or behind something. If you leave the shadows you're transparent but attentive people will notice you.
Astral Rage:
Taught by: Knowledgeable spirits.
Effect: Makes a living constellation made of stars to attack enemies with whatever weapon that constellation has.
Black Cloak:
Taught by: Planetary spirits. It takes extreme training in theory alone before you can attempt to try it since you have to be ready for the amount of power you'll get and you have to remember to use it sparingly. It's common to use an attack spell and send out so much power that you hurt a lot of people on accident or hurt yourself so control is a must when learning this.
Effect: Since planetary spirits don't have star dress this is the equivalent. It gives you complete access to the spirit's magic and power. You can use their magic with just as much power and skill as they can and you share a pool of magic. Most planetary spirits don't like to share so it's hard to convince them to teach to you this at all.
Non-Contact Summoning
Taught by: It's like forcing a gate closed or multiple summons. It can't be taught you just kinda do it.
Effect: You open a spirit's gate without direct physical contact with the key. It has to be within a few feet of where you are but you can still open the gate.
Sacrifice:
Taught by: You don't need to be taught it, but not many wizards are brave enough to use it.
Effect: Summons every single one of your spirits and gives them an infinite supply of power. Unlike usual summoning it doesn't limit them based on your power so they have whatever their peak power is in the spirit world. The cost for using this technique is your life. Upon death your body becomes a constellation and you're reincarnated as a celestial spirit.
That last one is just what I hope happens to Yukino. Lucy, despite not learning any new magic and not buying any silver keys, could benefit from Pisces and Libra more so I think that would be a good way to give Lucy the keys without technically killing Yukino off. She could be reincarnated as a spirit and end up with Lucy as a keyholder.
