Ironclad

Fighters that revive the ancient tradition of the last Ironclad make pacts with demons in exchange for their choice of both martial techniques and demonic powers. The way these warriors defeat their foes is through weaving these techniques and powers to create a burning onslaught of attacks.

First technique

At level 3, you receive your first boon from your patron, which is a choice between 2 offensive techniques for you to use. Pick either heavy blade or inflame to learn. You can change your choice at the end of a short rest.

Heavy blade

You may take a -2 penalty to any amount of attack rolls you make each turn to do one extra die of your weapon's damage if that attack is successful. Heavy blade+ (lv 10+): you may make this a -4 penalty to do two extra dice of damage instead

Inflame

You can use a bonus action to set your currently wielded weapon(s) ablaze for 1 minute or until you are incapacitated or die. While ablaze your weapons emanate 5 ft of bright light and 5ft of dim light while also doing an extra d4 of fire damage. You can use this feature an amount of times each day equal to your charisma modifier. Inflame+ (lv10+): Your inflame damage die now increases to a D6. Additionally you can choose to immolate by choosing to  take 1D6 fire damage each turn inflame is active. Immolating causes everyone other than yourself within 5ft of your inflamed attacks' targets to also take the inflame damage.

Burning blood

Additionally at level 3, the power your demonic patron has given you has seeped into your blood, healing you. When you roll initiative, you heal an amount equal to your charisma modifier.

Defensive boon

At level 7, your patron has taught you a second technique, but this time it is so you don't meet your demise before their will is done. Pick either Iron wave or Flame barrier to learn. You can change your choice at the end of a short rest.

Flame barrier

You can expend a use of second wind as a bonus action to cast armour of agathys at a level equal to your proficiency bonus. When cast in this way the spell deals fire damage instead of cold.

Iron wave

By weaving offense and defence into one fluid motion, you gain temporary HP equal to your proficiency bonus every time you hit a creature with a weapon attack. This temporary HP lasts until the start of your next turn and can stack with itself if gained on the same turn.

Advanced offensive techniques

Your patron has finally deemed you powerful enough to teach you the advanced forms of your first techniques.

Heavy blade+:  You now may take a -4 penalty to your attacks to add two extra dice of damage instead of one die

Inflame+: Your inflame damage die now increases to a D6. Additionally you can choose to immolate by choosing to  take 1D6 fire damage each turn inflame is active. Immolating causes everyone other than yourself within 5ft of your inflamed attacks' targets to also take the inflame damage.

Black blood

Your patron's power in your blood grows, bolstering your healing. You may add your proficiency bonus to your burning blood healing. Additionally, due to the corruption in your blood, when a creature consumes your blood they take necrotic damage equal to your proficiency bonus.

Final technique

Your patron has finally deemed you worthy of learning your final technique.  Pick either Bludgeon or Reaper to learn. You can change your choice at the end of a short rest.

Bludgeon

You may sacrifice any amount of attacks before making an attack roll to multiply that attack's damage dice by double the amount of sacrificed attacks. (e.g. sacrifice 2 attacks to make another do 4 times the damage).

Reaper

You may expend one use of indomitable to force all creatures of your choice within a 20ft of you to make a constitution saving throw (DC=8+ proficiency bonus+ charisma modifier) or take necrotic damage equal to 3d6+ your charisma modifier, on a success they take half as much damage. You then heal HP equal to the necrotic damage dealt by this ability.

Demon form

Your patron's power has now seeped into not just your blood, but your very being. When you use action surge, you may take on a demonic form of 1 minute or until you die. For the same duration you can use both options from all of your previous features.