Prismatic Domain

It is no coincidence that a spell such as revivify requires a diamond, nor is it mere happenstance that the most powerful arcane foci involve gemstones. The natural power stored within crystals resonate with magical energy. While the purity of a diamond is necessary for resurrection, lesser gemstones can be used to empower other spells in a variety of ways.

Domain Spells

Each domain has a list of spells - its domain spells that you gain at the cleric levels noted in the domain description. Once you gain a domain spell, you always have it prepared, and it doesn’t count against the number of spells you can prepare each day.

If you have a domain spell that doesn’t appear on the cleric spell list, the spell is nonetheless a cleric spell for you.

(For legal reasons, Chromatic Orb cannot be added to this homebrew. Choose an appropriate spell to replace it with, or use the "DNDBeyond Won't Let Me Have Illegal Spell Lists" feat instead.)

Cleric Level	Spells
1st	chromatic orb, color spray
3rd	mirror image, shatter
5th	clairvoyance, hypnotic pattern
7th	fabricate, stoneskin
9th	creation, greater restoration

Crystalline Magic

As part of a short or long rest, you can cast any number of spells of 1st level or greater with a casting time of 1 action, expending spell slots as usual and transforming their energy into a Tiny crystalline structure. As an action, you can release a spell crystallized in this way, destroying the crystal and triggering its effect.

Emerald. A creature of your choice within 30 feet gains 1d6 temporary hit points.

Ruby. Make a ranged spell attack against creature of your choice within 30 feet. On a hit, the target takes 1d6 radiant damage.

Sapphire. Choose a creature within 30 feet. The target can use its reaction to move up to half of its movement speed. This movement doesn’t provoke opportunity attacks.

If you have any remaining crystallized spells when you finish a long rest, the magic within them dissipates. They also instantly dissipate if they are over 5 feet away from you.

In addition, any spell that requires a gemstone or other crystal as a material component can use the gemstone in place of the material component. While otherwise lacking monetary value, gemstones created in this way have a gold value equal to your Cleric level x 50 for the purposes of material components, and can be used only on the spell contained within the crystal.

Refractive Index

When placed at just the right angle, a prism can transform light from one color into another; the same is possible with magic. As a bonus action, you can spend your Channel Divinity to change a crystallized spell to a different one of the same level without spending a spell slot.

Rainbow Connection

When you cast a fire, cold, lightning, poison, or acid spell, you can turn its damage type into any of the other damage types. In addition, when you cast a spell that deals radiant damage, you can make it deal one of the previous types. For instance, you could make a guiding bolt deal cold damage, but you cannot make a fireball deal radiant damage.

Once you transmute a spell in this way, you cannot transmute another spell into that damage type until you finish a long rest.

In addition, you learn a spell that deals damage of each of those damage types, of a level that you can cast. When you cast a spell learned in this way, you cannot cast it again until you finish a long rest. You can exchange a spell learned in this way for another of an appropriate level and damage type when you gain a level in this class.

Potent Spellcasting

Starting at 8th level, you add your Wisdom modifier to the damage you deal with any cleric cantrip.

Wonderwall

You learn the prismatic wall spell. While it is active, you can use the effects of the Emerald, Ruby, and Sapphire crystals at the end of each of your turns, without expending any of your crystallized spells.