Knight of Holy Order Fighter

This subclass requires Aasimar to spend long hours honing their ability to keep their mind in order.

Order's Oath

Starting at 3rd level, you have an oath you swore with the Holy Order, swearing to be a knight of order. Choose one of the following Knight's Oaths to take. You can't switch Oaths in any way other than going to the Knights of Holy Order, and getting it changed by a high priest.

Holy Avenger: When you reduce a creature that dealt damage to you or your ally within the last minute to 0 hit points, you gain Temporary Hit Points equal to your Constitution modifier + your Fighter level.

Holy Sentinel: Any creature within your sight has disadvantage on rolls to grapple you or to escape being grappled by you.

Holy Warrior: You deal extra Radiant damage with all Melee attacks equal to half your Fighter level(rounded up). 

Holy Guardian: Your AC can't be lowered by any means other than removing armor, and you get a +1 to your AC.

 

Holy Avenger

When you reduce a creature that has dealt damage to you or your ally within the last minute to 0 hit points, you gain temporary hit points equal to your Constitution modifier + your Fighter level.

Holy Guardian

Your AC can't be lowered by any means other than removing armor, and you get a +1 to your AC.

Holy Sentinel

Any creature within your sight has disadvantage on rolls to grapple you or to escape being grappled by you.

Holy Warrior

You deal extra Radiant damage with all Melee attacks equal to half your Fighter level(rounded up). 

Power of Order

Starting at 7th level, depending on what Knight's Oath you have, you gain one of the following features: 

• Holy Avenger: You gain the Channel Divinity and Relentless Avenger features from the Oath of Vengeance. You have one use of Channel Divinity.
• Holy Sentinel: You gain the Channel Divinity features form the Oath of Conquest and the Aura of the Sentinel feature from the Oath of the Watchers. You have one use of Channel Divinity.
• Holy Warrior: You gain the Channel Divinity: Guided Strike and Channel Divinity: War God's Blessing features of the War Domain. You have one use of Channel Divinity.
• Holy Guardian: You gain the Channel Divinity: Order's Demand feature from the Order Domain and the Aura of the Guardian feature from the Oath of Redemption. You have one use of Channel Divinity.

Power of the Celestial

Your celestial abilities increase in power. You gain immunity to Radiant and Necrotic damage, and you also gain one of the following features.

• Radiant Self: You must be a Protector Aasimar to gain this feature. This replaces Radiant Soul. Your entire body begins to glimmer and shine, you sprout four incorporeal wings, and your eyes glow bright blue. For one minute, you gain the following effects: 
  • You get 60ft of flying speed.
  • You deal your level in extra Radiant damage with every melee attack.
  • You shine bright light in a 20ft radius, and dim light for another 20ft.
• Radiant Annihilation: You must be a Scourge Aasimar to gain this feature. This replaces Radiant Consumption. You unleash the divine power within you to make searing light radiate from you, burning everything around you. For one minute, you gain the following effects: 
  • You radiate bright light for 40ft and dim light for an additional 40ft.
  • You deal 3d6 extra Radiant damage with every melee attack. 
  • Every creature of your choice in a 40ft radius of you takes Radiant damage equal to your level at the start of each of your turns.
  • You can use an attack to launch a beam of light. It counts as a ranged spell attack, uses Charisma to hit and for damage, and it hits all creatures in a 60ft line stemming from your mouth, the source of the beam. It deals 3d8 Radiant damage to all creatures it hits.
• Necrotic Veil: You must be a Fallen Aasimar to gain this feature. This replaces Necrotic Shroud. Your eyes turn dark, and four skeletal, ghostly wings sprout from your back. For 1 minute, you gain the following benefits:
  • Your melee attacks deal 3d6 extra Necrotic damage
  • At the start of each of your turns, all creatures within 20ft of you must succeed a Charisma save (DC 8 + proficiency bonus + Charisma modifier) or become frightened of you for the duration of Necrotic Veil.
  • All creatures that start their turn within 10ft of you have half movement speed, and if they are frightened by you, their speed drops to 0 in this range.

If you go by the MofM Aasimar rules, choose whichever one you want and it will replace Celestial Revelation.

Vow of Order

Starting at 15th level, you gain more features based on what Knight's Oaths you have:

• Holy Avenger: You gain the Soul of Vengeance feature from the Oath of Vengeance. Also, if an ally of yours within 60ft of you drops to 0 hit points, if a creature caused them to you gain advantage on all attack rolls against them, and any hit for the next round is an automatic crit against them. The advantage lasts one minute.
• Holy Sentinel: You gain the Vigilant Rebuke feature from the Oath of Redemption. Also, you can cast Command at will without components. The save DC is equal to your Fighter level.
• Holy Warrior: You gain the Scornful Rebuke feature from the Oath of Conquest. Also, you can cast Summon Celestial once per long rest.
• Holy Guardian: You gain the Protective Spirit feature from the Oath of Redemption. Also, you resist Bludgeoning, Piercing, and Slashing damage from weapon attacks.

Knight of Holy Order

Starting at 18th level, as a bonus action you can take on a form, becoming the apparition of order, bane of chaos. While in this form, you gain the following benefits: 

• You resist damage dealt by AoE attacks (spells, effects, etc).
• Any hits against a Chaotic creature crit automatically.
• You can cast spells, and the spells you have depend on your Oath. Use Charisma as your spellcasting ability for these spells, and they require no material components: 
  • Holy Avenger: 
    • At Will: Bane
    • 5/long rest: Fear
    • 3/long rest: Hold Monster
    • 1/long rest: Delayed Blast Fireball
    • 1/week: Storm of Vengeance
  • Holy Sentinel: 
    • At Will: Compelled Duel
    • 5/long rest: Crusader's Mantle
    • 3/long rest: Banishing Smite
    • 1/long rest: Divine Word
    • 1/week:  Ravenous Void
  • Holy Warrior: 
    • At Will: Wrathful Smite
    • 5/long rest: Haste
    • 3/long rest: Destructive Wave
    • 1/long rest: Conjure Celestial
    • 1/week: Time Ravage
  • Holy Guardian: 
    • At Will: Armor of Agathys
    • 5/long rest: Life Transference
    • 3/long rest: Wall of Force
    • 1/long rest: Forcecage
    • 1/week: Invulnerability