The pact of the Chain breaker

Your patron has chosen to gift you with a magical scythe named Chainbreaker. This large scythe has a smooth iron blade attached to a purple and grey Damascus steel pole, a short length of chain at the back end of the weapon, and three onyx spheres set into the pole about a foot from the balance point of the weapon (just above where your hand is when wielding the scythe).

Chainbreaker

You can use your action to make a magical scythe (1d10 slashing damage, reach, heavy) appear in your hand. You are proficient with it while you wield it.

It is magical for the purposes of overcoming resistance.

The scythe disappears if it is more than 5 ft from you for 1 minute or more. It also disappears if you dismiss the weapon, or if you die.

You can feed one magic weapon into Chainbreaker by performing a special ritual while holding the weapon. You perform the ritual over the course of 1 hour, which can be done over a short rest, at the end of the ritual the weapon is consumed by purple black flame and your scythe takes on the properties of the consumed weapon. You can't affect an artifact or sentient weapon in this way. Your scythe retains its reach. The weapon reappears if you die, if you perform this one hour ritual on a different weapon, or if you use a 1 hour ritual to break your bond with it.

Invocations

Fiendish Flourish:
Prerequisite: Pact of the Chain Breaker
Allows you to use your Charisma modifier in place of your Strength modifier for attack and damage rolls made with Chainbreaker.

Eldritch Armor:
Prerequisite: Pact of the Blade
As an action, you can touch a suit of armor that isn’t being worn or carried by anyone and instantly don it, provided you aren’t wearing armor already. You are proficient with this suit of armor until it’s removed.

Bane of Cerberus:
Prerequisite: Pact of the Chain Breaker
Whenever you deal damage to a creature that is concentrating on a spell that creature has disadvantage on it’s saving throw to maintain concentration

Desirat's Inferno:
Prerequisite: Pact of the Chain Breaker
Your flames burn hotter than any on this plane, creatures that have resistance to fire damage take full damage from any fire damage done by you; creatures with immunity to fire take half damage.

Breaker of chains:
Prerequisite: Pact of the Chain Breaker, 7th level
You can cast freedom of movement once without expending a spellslot. You cannot do so again until you finish a long rest.

Eldritch Battle magic:
Prerequisite: Pact of the Chain Breaker, 15th level
If you use your action to cast a warlock cantrip or spell using either a spell slot or invocation, then you can use your bonus action to either summon Chainbreaker or make a weapon attack with Chainbreaker.
This invocation does not come into play when casting spells using your Mystic Arcanum feature.

Combat Aura
Prerequisite: 15th level, Pact of the Chain Breaker
If you make an attack roll with Chainbreaker without disadvantage and miss a target within range, on a die roll of 2 or higher, the target takes force damage equal to your Charisma modifier (minimum of 1). However, the attack is still considered a miss and triggers no other weapon or attack effects.

L10

level 10 ability placeholder so I can submit this pact as a "subclass"

L14

placeholder, see L10