It's similar to what I've created, it's something original, using FFXIV world and plot. You can see the link in my signature.
Into short words, my concept is more a Job that can shift between Tank, Healer and DPS. Though, I've only finished the DPS part, leaving the Tank stance and healer stance only as a brief sketch, without any interactions/trait altering the skills.
Basically it has The Aether Blade Stance, which depletes MP for more power, and it can adapt this power if he's using Crystal Blade (Tank stance) or Life Blade (Healer stance). Using Aether Blade alone, gives more damage to enemies who has the Aether resistence down Dbuff, but does less damage to who don't have the dbuff. Combining with Crystal blade, you receive % less damage, more aggro, while some of the damage goes to deplete more MP. Combining With Life blade, adds % more heals, while converting overheals into shields, that does not stack.
Aether Blade
Spell | instant | 2.5s Cooldown | 0y /5y
Buffs current weapon with Aether Power, 25% more potency to Life Blade and Crystal Blade, dealing 25% more damage to Aether weakened targets and 25% less damage to Normal targets.
Deals damage with a potency of 200, Knockback 15y and binds for 5s the first enemy within 5y that damages caster during 5s initial duration of Aether Blade and generates Anima.
Depletes MP over time, and unable MP regeneration or Refresh.
Effect ends upon reuse or 0 MP.
Crystal Blade
Spell | instant | 2.5s Cooldown (30s recast)| 0y /0y
Buffs current weapon with Crystal Power, Receiving 60% less damage, drawing more emnity and dealing 40% less damage to Aether Weakned targets, while receiving 50% less damage and dealing 40% less damage to Normal targets. Converts a portion of damage dealt from Spells or Time to HP shield. Partially mitigate the damage received to MP while Aether Blade is active.
Shares recast time with Life Blade.
Life Blade
Spell | instant | 2.5s Cooldown (30s recast)| 0y /0y
Buffs current weapon with 40% more Healing Power, able to Heal party members with all damage Spells and specific Abilities, except Weaponspells, also dealing 25% less damage to Aether weakened targets and 50% less damage to Normal targets.
All overheals will convert into a HP shield, does not stack, but higher overheals replaces the lesser ones.
Shares recast time with Crystal Blade
It has some internal mechanics such as: It has weak Spells, but each usage of weaponspell gives 40% more potency to the next spell, up to 4 Stacks (160%).
All spells are into a delay effect, which can be unleashed with the Time Ability at any time.
It surely has the tank stance and healer stance pretty raw, but it's pretty clear the idea with just the DPS side finished.
It has a lot more than that, but it's up to you to read.