The Warrior mage of Azerath Class for Dungeons & Dragons (D&D) Fifth Edition (5e)

Base Class: Wizard

You were trained to help stem the tide from the untold hordes from the underworlds. When the Hells and the abyss marched side by side up on the material plane, the mage’s college Azerath turned it's Demi plane from a school to the last bastion of defense against the unending hordes. You were trained in the best skills to keep yourself alive and adapt to and ever changing battlefield. Taught both the fundamentals of magic, but no weakness was left with regards to the blade. After the end of time that never was, you are a remnant of teachings that were forgotten before they were ever made.

Training in War and Magic

When you adopt this tradition at 2nd level, you gain proficiency with light armor, and you gain proficiency with one type of one-handed melee weapon of your choice.

You also gain proficiency in one Tinker's tools, Smith's tools, Leatherworker's tools, Alchemist's supplies.

Bladegard

Starting at 2nd level, you can invoke an elven magic called the Bladegard, provided that you aren’t wearing medium or heavy armor or using a shield. It graces you with supernatural speed, agility, and focus.

You can use a bonus action to start the Bladesgard, which lasts for 1 minute. It ends early if you are incapacitated, if you don medium or heavy armor or a shield, or if you use two hands to make an attack with a weapon. You can also dismiss the Bladegard at any time (no action required).

While your Bladesong is active, you gain the following benefits:

You gain a bonus to your AC equal to your Intelligence modifier (minimum of +1)

Your walking speed increases by 10 feet.

You have advantage on Dexterity (Acrobatics) checks.

You gain a bonus to any Constitution saving throw you make to maintain your concentration on a spell. The bonus equals your Intelligence modifier (minimum of +1).

You can use this feature a number of times equal to your proficiency bonus, and you regain all expended uses of it when you finish a long rest.

Lore Mastery

Starting at 6nd level, you become a compendium of knowledge on a vast array of topics. Your proficiency bonus is doubled for any ability check you make that uses the Arcana, History, Nature, or Religion skill if you are proficient in that skill.

In addition, your analytical abilities are so well-honed that your initiative in combat can be driven by mental agility, rather than physical agility. When you roll initiative, it is either an Intelligence check or a Dexterity check for you (your choice).

Spell Secrets

At 6nd level, you master the first in a series of arcane secrets uncovered by your extensive studies.

When you cast a spell with a spell slot and the spell deals acid, cold, fire, force, lightning, necrotic, radiant, or thunder damage, you can substitute that damage type with one other type from that list (you can change only one damage type per casting of a spell). You replace one energy type for another by altering the spell’s formula as you cast it.

When you cast a spell with a spell slot and the spell requires a saving throw, you can change the saving throw from one ability score to another of your choice. Once you change a saving throw in this way, you can’t do so again until you finish a short or long rest.

Altering Spells

While the Spell Secrets feature offers increased versatility, at the table its effects can be difficult to spot by the other players. If you’re playing a savant, take a moment to describe how you alter your spells. Think of a signature change your character is particularly proud of. Be inventive, and make the game more fun for everyone by playing up the sudden, unexpected tricks you character can employ. For example, a Fireball transformed to require a Strength save might become a sphere of burning rock that shatters and slams into its target. A Charn Person that requires a Constitution save might take the form of a vaporous narcotic that alters the target’s mood.

Alchemical Casting

At 10th level, you learn to augment spells in a variety of ways. When you cast a spell with a spell slot, you can expend one additional spell slot to augment its effects for this casting, mixing the raw stuff of magic into your spell to amplify it. The effect depends on the spell slot you expend.

An additional 1st-level spell slot can increase the spell’s raw force. If you roll damage for the spell when you cast it, increase the damage against every target by 2d10 force damage. If the spell can deal damage on more than one turn, it deals this extra force damage only on the turn you cast the spell.

An additional 2nd-level spell slot can increase the spell’s range. If the spell’s range is at least 30 feet, it becomes 1 mile.

An additional 3rd-level spell slot can increase the spell’s potency. Increase the spell’s save DC by 2.

Prodigious Memory

At 14th level, you have attained a greater mastery of spell preparation. As a bonus action, you can replace one spell you have prepared with another spell from your spellbook. You can’t use this feature again until you finish a short or long rest.

DM note. This is based on a variant of allowing people to gain cross profession subclass. Taking the first step of bladesinger, and removing the last step of loremaster.