At 2nd level, you know three cantrips of your Magic discovery class table.

You have a font of magic that fuels your energy, allowing you to cast spells.

Monk :You gain the use of Martial Arts and Unarmored Defense, counting the progress of your martial arts as one third of your red mage level for the purpose of calculating your martial arts damage die.

Barbarian : you gain the use of Rage as shown in the barbarian table, as well as the rage damage and unarmored defense, counting the progress as one third of your red mage level for purposes of calculating your uses of rage and rage damage.

Fighter You gain one fighting style of your choosing, and gain proficiency on medium armor and shields, additionaly, you gain the use of second wind, counting as one third of your mage level for the purpose of calculating the healing done by second wind (minimum 1)

Rogue : You gain the use of Sneak attack, counting as one third of your red mage level as if you were a rogue for the purposes of calculating the damage of sneak attack (minimum level 1)

Starting at 1st level, choose one of the following classes: Barbarian, Monk, Fighter or Rogue. you gain the following benefits acording to which class you chose

Starting at 1st level, choose one of the following classes: Bard, Cleric, Druid, Sorcerer, Warlock or Wizard. You use the primary ability and spell list from the chosen class (Charisma for Bard, Sorcerer and Warlock, Wisdom for Cleric and Druid and Intelligence for Wizard)

As a Red mage, you gain the following class features

Spell slots

The red mage table shows how many spell slots you have to cast your spells of 1st level and higher. To cast one of these spells, you must expend a slot of the spell's level or higher. You regain all expended spell slots when you finish a Long rest.

Martial feature

Starting at 3rd level, and then again on 7th level, you choose one of the following features, you cannot choose the same feature twice

Rogue You gain the Cunning action class feature from the Rogue class

Fighter You gain the feat Martial adept with the following modifications: You learn 3 manuevers instead of 2 and you gain 3 Superiority dies instead of one

Barbarian you gain the Reclkess Attack class feature

Monk you gain the Ki class feature(gaining only 1 ki point)

In 7th level, you also may choose from the following features

Rogue You gain the uncanny dodge feature

Fighter You gain the Extra attack Feature

Monk you gain the stunning strike feature, you also gain 1 more ki point

Ability score Improvement

When you reach 4th level, and again and 8th, 12th, 16th and 19th level, you can increase one ability score of your choice by 2, or you can increase two ability scores of your choice by 1. As normal, you can't increase an ability score above 20 using this feature

Magic Feature

At 5th level, and again at 10th level you choose one of the following class features:

Bard you gain the bardic inspiration feature, your bardic inspiration is a D6 and you have a pool equal to half your charisma modifier (minimum 1)

Cleric you gain the channel divinity feature as if you were a 2nd level cleric, choose one domain from the cleric class feature.

Sorcerer You gain sorcery points class feature, you may choose up to one metamagic option, and you have a number of sorcery points equal to the number required to cast that metamagic +1

Warlock you choose one eldritch invocation from the eldritch invocation list, you count as one third of your red mage level as a warlock level to determine the requirements of an eldritch invocation

Wizard you gain the first feature of one arcane tradition of your choosing

At 10th level, you can also choose from the following

Bard you gain the cutting words class feature, your bardic inspiration becomes a D8 and you gain one more use of your bardic inspiration

Warlock you gain one Eldritch invocation (with the requirements showed above) plus you can choose one pact boon.

DoubleCasting

Starting at 6th level, you can cast two spells who share the same slot, target and casting time, spending a spellslot for each one of the spells (as you were casting two spells separately) you choose in which order they resolve. After using a feature, you gain one level of exhaustion and lose hitpoints in psychic damage equal to 1d8 per slot expended plus 1d8 for each slot expended above the first (2d8 for second level spell slots, 3d8 for third level spell slots and so on)

Spell siphon

At 11th level, when you score a critical hit with a ranged spell attack or with a melee weapon you're holding, you regain one slot of the lowest level aviable. Additionaly, once per long rest, when you regain a spell slot this way, you can remove one spell slot of half the level regained (rounded down) from the target, assuming that he can cast spells. if you remove a spell slot this way, you remove one exhaustion level.

Superior Martial discovery

Starting at 12th level, and again in 18th level, you gain one of the following class features

Barbarian your hit die becomes d10, adjusting your total hitpoints accordingly

Fighter you gain the improved critical class feature from the champion archetype. You become proficient on heavy armor

Monk you gain unarmored movement as if you were a 10th level monk

Rogue you gain the Uncanny dodge and Evasion class features

In 18th level, you can also choose from the following

Monk you gain the Stillness of mind class feature, as well as the Ki-empowered strikes.

Barbarian you gain the Brutal critical class feature, and if you didn't have the extra attack feature, you gain the Extra attack feature.

Improved Doublecasting

You no longer gain exhaustion from the Doublecasting feature.

Superior magic feature

Starting at 15th level, and then again at 19th level, you choose on of the following features, you cannot choose the same feature twice.

Bard you gain the magical secrets and expertise class features

Cleric you gain the divine intervention and Destroy Undead class features, you count as half your red mage level for the purposes of these features.

Druid you gain the Wild shape class feature, and you count as an 8th level druid for the purposes of this feature.

Sorcerer you gain the sorcery and metamagic(choosing one metamagic) class features, and your sorcery points pool becomes 9

Warlock you gain the Mystic Arcanum class feature