Keyblade Master Prestige Class

Prestige Class: Keyblade Wielder
The Keyblade Wielder is a warrior who wields a powerful weapon known as a Keyblade. They possess the ability to travel between worlds and harness the power of light to combat the forces of darkness.
Keyblade Wielder Features:
Requirements: To qualify for the Keyblade Wielder prestige class, a character must meet the following prerequisites:

• Proficiency in martial weapons.
• The ability to cast spells.
• The character must have encountered a Keyblade and formed a connection with it, typically through a significant event or storyline moment.

Upon obtaining the Keyblade Master Prestige class you gain unarmored defense when you are not wearing armor. Your AC equals 10+str mod+chr mod.
Keyblade Bond: At 3rd level, you forge a deep bond with your Keyblade. You gain proficiency with Keyblades, which count as a martial weapon with the finesse property. Additionally, you can use your Charisma modifier in place of your Strength or Dexterity modifier for attack and damage rolls with Keyblades.
Spellblade Techniques: At 7th level, your connection to the Keyblade grants you the ability to infuse your weapon strikes with magical power. When you hit a creature with a Keyblade attack, you can expend a spell slot to deal additional damage equal to the level of the expended spell slot plus your Charisma modifier. The damage type is based on the spell's damage type or your Keyblade's inherent nature (such as radiant, force, or elemental damage).
Dimensional Traveler: At 10th level, you gain the ability to traverse different planes of existence. Once per long rest, you can cast the spell Plane Shift without expending a spell slot. Additionally, you have advantage on saving throws against being charmed or frightened by creatures from other planes.
Keyblade Transformation: At 15th level, your mastery over the Keyblade allows you to unleash its true potential. As a bonus action, you can activate a Keyblade Transformation. Choose one transformation from a list of available forms. Each transformation provides unique benefits and abilities, enhancing your combat prowess and versatility. You can switch Keyblade Transformations once per short or long rest.
Light's Champion: At 18th level, you become a beacon of light against the forces of darkness. You have resistance to necrotic and radiant damage. Additionally, when you deal radiant damage with a Keyblade attack, you can maximize the damage instead of rolling, and undead creatures have disadvantage on saving throws against your Keyblade spells.
Keyblade Transformations:

1. Elemental Fury: Your Keyblade transforms into an elemental form, granting you control over the forces of nature. You gain resistance to a chosen damage type: fire, cold, lightning, acid, or thunder. Additionally, your Keyblade attacks deal additional damage of the chosen type equal to your Charisma modifier.
2. Guardian's Shield: Your Keyblade transforms into a large shield, providing enhanced defense and protection. While in this form, you gain a +2 bonus to your AC. Additionally, as a reaction when a creature within 10 feet of you is hit by an attack, you can use your Keyblade to interpose and impose disadvantage on the attack roll.
3. Swift Striker: Your Keyblade transforms into a pair of dual-wielded blades, increasing your agility and speed in combat. While in this form, your movement speed increases by 10 feet, and you can make an additional attack as a bonus action when you take the Attack action.
4. Sorcerer's Embrace: Your Keyblade transforms into a staff-like weapon, enhancing your spellcasting abilities. While in this form, you gain a +2 bonus to spell attack rolls and the saving throw DC of your Keyblade spells. Additionally, when you cast a spell using your Keyblade, you can target one additional creature within range.
5. Time Bender: Your Keyblade transforms into a pocket watch-like weapon, granting you control over time itself. While in this form, you can use your action to cast the spell Slow without expending a spell slot. Once you use this feature, you can't use it again until you finish a long rest.