Machine Domain

Whilst the flesh fails, the steel endures.

The rites of manifold applications, the liturgies of ignition and the songs of Engine-seeing are their own to know. They speak to the spirits of ancient tech-machines, from the warrior heart of a battle tank to the secret wisdom of the cogitators.
A Machine Domain cleric carries with them a congregation of machine-spirits, tiny servitors, cog-cherubs, skittering drones and clicking skulls, each one a miracle that they built, repaired, or spiritually awakened. Heavily trained in the art of war and able to monitor and control the battlefield with machine-like precision, the ancient and dreaded art of battle-robotics they still study has made many whom interacted with the Machine Domain members consider them dangerous.

Tools Of The Machine-Forger

Years of study, devotion, and the hum of machinery have attuned you to the spirits of engines and constructs. You move among gears and wires as others move among prayers and psalms, repairing what is broken and commanding what is unthinking.

At 3rd level, you gain expertise with Tinker's Tools. In addition, you can cast the mending cantrip at will as an action, using Wisdom as your spellcasting ability. When you cast mending on a creature other than yourself in this way, the spell restores 1d8+ your Wisdom Modifier Hit points. You can restore hit points this way a number of times equal to your proficiency bonus, and regain all expended uses when you finish a long rest.
You can additionally communicate with constructs, even if they do not have a language. In addition, you have advantage on the Influence action(Charisma Checks) made to interact with constructs.

 

Domain Spells

You gain domain spells at the cleric levels listed in the Machine Domain Spells table. 

Machine Domain Spells

Cleric LEVEL	SPELLS
3rd	Summon Vehicle, Armament
3rd	Heat Metal, Enhance Ability
5th	Tiny Servant, Conjure Constructs
7th	Summon Construct, Mordenkainen's Private Sanctum
9th	Animate Objects, Creation

Channel Divinity: Summon Machinant

Starting at 3rd level, you can use your Channel Divinity to summon a Machinant, a divine-mechanical assistant.
Through your rites you call forth a divine-mechanical assistant, whose purpose is singular: to serve, protect, and enact your will. The creature possesses limited intelligence, yet is still sentient, as the soul runs in the wires.

As an action, you summon a Medium Construct that appears in an unoccupied space you can see within 30 feet of you. The Machinant remains until it is destroyed. Once a Machinant is summoned, the CD slot used to create it cannot be used again until the Machinant is destroyed. If a feature or item allows you to use the Channel Divinity withour expending its uses, the Machinant explodes upon appearing, dealing 40d6 damage to the person attempting to summon it. It acts immediately after your turn and follows your mental commands, which you issue as a bonus action. If no action was issued, the creature automatically takes the dodge action. Mulitple Machinants are commanded with the same bonus action.

The Machinant uses your spell save DC and spell attack bonus for its attacks and save DCs.

Gearwork Mastery

Your devotion to the Omnissiah manifests in both creation and animation. You have learned to bind life into metal, giving form and function to otherwise inert matter.
At 6th level, you learn the Fabricate, which does not count against your prepared spells. You can cast fabricate once as an action without expending a spell slot per long rest. When you cast Fabricate in this way, you can animate one nonmagical object you create. The object remains animated for 8 hours. This object is commanded with the same bonus action as the servitors.

 

 

Servitor Upgrade:

Your servitor's Arc Lash deals an additional 2d6 damage, and it gains an additional +2 bonus to attack and damage rolls.

Omni-Machinant Maximus

At 17th level, your communion with the Omnissiah extends to yourself.
You count as both your original creature type and a construct. You no longer need to eat, drink, breathe, or sleep. You are immune to disease, poison damage, and the poisoned condition. Your body is no longer subject to the normal effects of aging; you cannot suffer age-related penalties, even by magical means, though you still die when your time is up. 

In addition, you can now summon an Omni-Machinant. To summon an Omni-Machinant, you must spend 2 Channel Divinities, or cast Creation at 6th level or higher as an action. The Omni-Machinant remains until it is destroyed. Once an Omni-Machinant is summoned, the slot used to create it cannot be used again until the Machinant is destroyed. If a feature or item allows you to use this feature withour expending its uses, the Omni-Machinant explodes upon appearing, dealing 40d6 damage to the person attempting to summon it.  It acts immediately after your turn and follows your mental commands which you issue with a bonus action. This bonus action is also used to command any Machinants.