Magus Martialis

Prestige 1: Eternal Bladesong

Combining blade and magic has become second nature to you. Your bladesong is eternal and always active. Years of empowering yourself with magic have permanently altered you: your Intelligence score is set to 30. Your movement speed is doubled. You add your spellcasting modifier to your AC, saving throws, skill checks, and attack rolls. You add a number of d10s equal to your spellcasting modifier when you deal damage. You can replace any number of attacks with casting a cantrip, rather than just one.

Symphony of Blade: As a bonus action, you can spend a Bladesong charge to activate an aura for an hour with a radius of up to 80 feet around you. While within the aura, allies gain the benefits of your Eternal Bladesong (bonus to AC, saving throws, skill checks, and attack rolls), but the damage bonus is equal to your spellcasting modifier in d8s rather than d10s. Hostile creatures within the aura are considered within reach for your melee attacks. This aura does not stack with Aura of Protection, as you are an atheist.

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Prestige 2: The Battle Mage

Years of combat experience have molded you into a deadly frontline warrior. You are always under the non-magical effects of Telekinesis, Foresight, Haste, and Mind Blank these effects do not use your concentration. Your maximum hit points are increased by half your Intelligence modifier, multiplied by your base hit points (5 × Max HP). This becomes your new base HP. All saving throws you make are considered magical.You gain an additional reaction. Whenever you take the Attack action on your turn, you can attack a number of times equal to half your spellcasting modifier, instead of once. Additionally, your critical hit threshold is reduced by 2.

Dragon Heart: Your admiration for your wife has always pushed you to pursue greater strength. Through great effort, you have learned to emulate her both in body and spirit.
Titanium Scales: Dragon scales form over your body, rendering you immune to critical hits and any effects triggered by a critical hit. Additionally, when subjected to an effect that requires a Strength, Dexterity, or Constitution saving throw, you take no damage on a successful save.
Legendary Resistance (4/day): If you fail a saving throw, you can choose to succeed instead.

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Prestige 3: Home is Where Her Heart Is

You used to scare your wife with the close calls you faced during your adventuring days. When you ascended, you unconsciously bound yourself to your wife, Diana. Whenever you drop to 0 HP, you immediately heal for half her hit point maximum. You may use this feature twice per long rest. This healing occurs before any effects triggered by you hitting 0 HP take place. If you die, your body is destroyed, or your soul is destroyed or captured, you will reform back to life in your domain within 1d7 IRL days without any lasting effects, as your wife can perfectly recall you and manifest you back through your bond.

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Prestige 4: Domain of the Blade Maiden

You can invoke your domain, up to a 200-foot radius around you, as a free action. While in your domain or native realm,The damage you deal cannot be immune against, absorbed or resisted.You cannot take more than 10% of your max HP as damage in a single turn.You gain access to two legendary actions and one legendary reaction, which you may take at any time.

Garden of Blades (Legendary Action): Blades are summoned from the domain. All creatures within a 50-foot radius of the summoning point must make a Dexterity saving throw or take 20d100 slashing damage. On a successful save, they take two-thirds damage.

Gravity Sinkhole (Legendary Action): Magically augment the gravity within your domain. Creatures of your choice must make a Strength saving throw or take 20d100 force damage and become restrained and immobilized. On a successful save, they take two-thirds damage with no additional effects.

House Rules (Legendary Reaction): Whenever a creature augments a saving throw or uses a legendary resistance to succeed on a save against your spell or ability, they take slashing damage equal to 10% of their max HP.

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Prestige 5: Arcane Sovereignty

Your mastery over magic transcends mortal limits. Within your domain or presence:

You cannot lose concentration on a spell due to taking damage.Spells with a casting time greater than a bonus action are cast as an action.You gain access to spells from all classes and are considered to have them always prepared.

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Prestige 6: Matron of the Battle Maidens

You have constructed many constructs and automatons to assist you in your home. You control Battle Maidens, autonomous mechanical constructs under your complete telepathic control (use Iron Golem stats). They are always considered to be within your aura and benefit from it.Their maximum hit points are increased by twice your Intelligence score.You have a number of Battle Maidens equal to twice your Intelligence score.If a Battle Maiden is destroyed, it is replaced within 24 hours.

You can cast Animate Object spell at will. It is always considered at its max level. 

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Prestige 7: The Matriarch of Spell Swords

You are the pinnacle of what it means to be a spell sword.You can replace any number of attacks with spellcasting, instead of just one.Spells you cast do not consume resources.You can make a number of attacks equal to your Intelligence score.The bonus damage increases to d10s equal to your Intelligence score.

Your defense is just as flawless as your offense:Your maximum HP is increased by your Intelligence modifier, multiplied by your base maximum HP (10 × Base HP).Within your domain, no act of violence can occur without your permission. Creatures cannot cast spells, make attacks, or take offensive actions unless you allow it. 

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Prestige 8: Blade Storm

When you invoke the Domain of the Blade Maiden, the area fills with sword energy: ethereal waves of energy that respond to your will. Your will is sharp enough to cut anything.Within your domain, your intent to cut is sufficient to bisect anything.The range of your domain increases to 1 mile.Legendary actions from Domain of the Blade Maiden no longer require saving throws.The legendary reaction now deals damage equal to 50% of max HP.Creatures are vulnerable to all damage you deal, as the sword energy deteriorates their defenses.