Void Domain, Cleric

Along with the other sources listed in the Credits, this subclass took heavy inspiration from the Emptiness Domain Cleric presented in Sandy Petersen's Cthulu Mythos supplement, so much so that I hesitate to consider this an original work, and instead, a variation of what was presented in the supplement. Credits to him and his team.

Null Hexer

Unlike the Sternritter who draw on the luminosity of the heavenly bodies for their strength, the Null Hexer look to the vast expanse of space for theirs. They are even more secretive than the Sternritter and next to nothing is known about this small order of astronomers. At one point, they were an offshoot of the Sternritter but now function completely autonomously. Their goals, motivations, and intentions are a complete and utter mystery.

Bonus Proficiency

When you choose this domain at 1st level, you gain proficiency in two skills of your choice: Arcana, From-the-Beyond, Perception, or Stealth.

Vanish into Darkness

Starting at 1st level, when you are hit by an attack, you can use your reaction to take the Hide action if you are in dim light or darkness or if you have anything to hide behind within 5 feet of you. If you successfully hide from the target’s passive Perception, the attack misses. You can use this feature a number of times equal to your proficiency bonus per long rest.

Channel Divinity: Distort Space

Starting at 2nd level, you can use your Channel Divinity to distort physical laws nearby.
As an action, you present your holy symbol and invoke the void’s influence to visibly twist space in a 10-foot radius sphere centered on yourself. The sphere moves with you, and it lasts for 1 minute, until you are incapacitated or die, or until you dismiss it as an action. The sphere produces visual distortions that provide half cover to you and other creatures of your choice within it.

Extradimensional Conduits

Starting at 6th level, you can use your action to create two visibly distorted 10-foot cubes of space. One cube appears adjacent to you and the other appears centered on a point you can see within 90 feet. The two spaces are linked. Creatures or objects of your choice that move through a cube's face appear within 5 feet of the other cube. A hostile creature can attempt to move through the space by making a Strength saving throw against your spell save DC. On a failed save, they take 1d10 force damage and do not move through the space.
You can use a bonus action to teleport a creature you can see within 5 feet of either of the cubes to an unoccupied space you can see within 5 feet of the other cube. The creature can resist being moved by succeeding on a Dexterity saving throw against your spell save DC. The cubes last for 10 minutes, until you dismiss them as an action, or if you use your action to create another pair of cubes. You can use this feature a number of times per long rest equal to your proficiency bonus.

Space-Folding Strike

Starting at 8th level, once on each of your turns, you can make a melee weapon attack or spell attack of up to 5th level as if your reach were 5 feet longer than normal, or you can make a ranged weapon attack or cast a spell of up to 5th level with a range greater than touch as if its range were doubled. When you hit a creature with that weapon or spell attack, you can cause the attack to deal an extra 1d6 force damage to the target. When you reach 14th level, the extra damage increases to 2d6. When you reach 17th level, you can use this feature to double the range of any spell of up to 5th level, although you don’t deal additional damage if you didn’t make an attack roll.

Void Expansion

Starting at 17th level, the Distorted Space created by your Channel Divinity increases to a 20-foot radius and ranged attacks that would pass through its area immediately miss, unable to traverse that space to the target.

Credit

https://www.dndbeyond.com/subclasses/97455-chronomancer
https://www.dmsguild.com/product/234311/Stargazer-Class-DD-5e https:/ /drive.google.com/file/d/1FO2-ci0Fsa8VIdOy8ba000Flt3sDexBX/view
https://homebrewery.naturalcrit.com/share/Hk1pqInWm
https://www.reddit.com/r/UnearthedArcana/comments/fqvv75/the_revised_astromancer_class_for_5e_v3_includes/
https://www.gmbinder.com/share/-M3CbZu0R4G7CbVcmMqN

Void Calling

You gazed too long, studied too tirelessly, or otherwise wished too strongly to see something in the unending expanse of space. Now, something has looked back. Something has seeped through the veil and touched your psyche. The void itself. Touched by nothingness, you draw your power from the limitless infinity of black space.
You recognize that true brilliance is not found among the stars, but in the vacuum that contains them; finding that the space between all things is not truly vacant, but filled with a unique power, ripe for use.

Null Hexer Expanded Spell List

The Void grants you an expanded list of spells at certain levels. You gain domain spells at the cleric levels listed in the Spells table below. See the Divine Domain class feature for how domain spells work.

Cleric Level	Spells
1st	feather fall, *space twist
3rd	darkness, misty step
5th	fly, pulse wave
7th	dimension door, gravity sinkhole
9th	contact other plane, *wall of dusk

*refers to a spell listed in the Astromancy spell list