Ritual Elements: 

Ashes: 

Smelt Rotten Flesh in the Furnace to get Ashes.

Frankenflesh: 

Combine Rotten Flesh with Ritual Thread to get Frankenflesh. 

Ectoplasm: 

Combine Ashes with Slime Balls to get Ectoplasm. 

Ritual Book: 

Combine books with Void Ink to get Ritaul Books. 

Blood Bottle: 

Use a Ritual Dagger or a Blood Syringe on a Villager to get Blood Bottles. 

Crafting Elements:

Ritual Thread:

Combine String with Ashes to get Ritual Thread. 

Ritual Rope: 

Combine three Ritual Thread together to get Ritual Rope. 

Void Ink: 

Combine Ashes with an Ink Sac and Glass Bottes to get Void Ink. 

Bone Rod: 

Combine Ritual Rope with Bones to get Bone Rods. 

Bone Shards: 

Crush Bones with a Pestle to get Bone Shards.  

Shadow Steel: 

Combine Ashes with Iron Ingots to get Shadow Steel. 

Rare Items: 

Frankenflesh Brain: 

Used to craft the Crude Frankenflesh Golem. 

Shadow Fabric: 

Used to craft Necromancer's Armor. 

Infused Ashes: 

Can be used to repair any Tool, Weapon or Armor from this Mod. 

It is also used to revive fallen Golems. 

Hellium: 

Used to craft unbreakable Weapons. 

Ritual Items: 

Crude Bone Golem: 

Use it to summon the Bone Golem. 

Crude Frankenflesh Golem: 

Use it to summon the Frankenflesh Golem. 

Crude Wraith Golem: 

Use it to summon the Wraith Golem. 

Ritual Book of Strength: 

Use this to get Strength II for one Minecraft day.

Ritual Book of Binding: 

Use this to get Regeneration and Health Boost II for one Minecraft day.

Ritual Book of the Traveler: 

Use this to get Speed II and Jump Boost for one Minecraft day. 

Golems: 

The Bone Golem: 

A ranged unit who shoots pretty fast. 

I would say the easiest to craft. 

The Frankenflesh Golem: 

A melee unit who can stun opponents by giving them the Shocked debuff. 

The Wraith Golem: 

A flying unit who can heal allies with magical, ranged attacks. 

Weapons: 

The Reaper's Scythe: 

A slower weapon with high damage. 

The Skull Breaker: 

A slow weapon that has a chance to inflict Slowness II on your enimies. 

The Dagger of the Lost: 

A fast weapon with Flaming, Venom, and Sharp versions. 

The Doom Fork: 

A pitchfork with faster attack speed. 

The Forsaken Sickle: 

A better Dagger, but without the Flaming and Sharp versions. 

Tools: 

The Ritual Dagger: 

This fast semi-weapon can be used to steal the blood of a Villager. 

The Blood Syringe: 

This tool has infinite durability and harvests more blood than the Ritual Dagger. 

The Commanding Staff: 

Holding this tool will tell your troops to follow you and can be used as a ranged tool to tell them who to attack. 

The Book of the Devil: 

Crafting this book will give you all the recipies for this Mod. 

The Pestle: 

This tool can be used to turn Bones into either Bone Meal or Bone Shards. 

Armor: 

Bone Armor: 

Crafted with Bones and Bone Meal. 

Shadow Armour: 

Crafted with Shadow Steel. 

Necromancer's Armor:

Crafted with Shadow Fabric. When wearing a full set of Necromncer's Armor, you get Invisibility and Speed when you fall below five health. 

Hell Knight Armor: 

Wearing a full set gives you Fire Resistance. It is also better than Netherite. 

Weapon Tiers: 

Scythes, Daggers, and Sickles all have most, if not all, the variant Weapon Tiers. 

Bone: 

A weapon tier tht has faster Attack Speed. 

Shadowed: 

When an attack lands, there is a thirty percent chance that your target will get Darkness. Good for PvP. 

Hellium (or "Flaming ______ of Doom"): 

All weapons made from Hellium are unbreakable. They also have a chance to set the target on fire. 

Crafting Blocks: 

Frankenflesh Block:

Used to craft the Crude Frankenflesh Golem. 

Wraith Block: 

Used to craft the Crude Wraith Golem.

Ritual Blocks: 

Pentagram: 

A block used to perform Rituals. 

To break it, you need Silk Touch, otherwise it drops Blood Bottles and very rarely it can drop one Infused Ashes. 

Bloody Altar: 

A full block that you don't need Silk Touch to break. 

Decorative Blocks: 

Cobbled Darkstone: 

Combine one Shadow Steel and eight Cobblestone to make eight Cobbled Darkstone. 

Darkstone: 

Smelt Cobbled Darkstone to get Darkstone. 

Smooth Darkstone: 

Smelt Darkstone to get Smooth Darkstone. 

Darkstone Bricks: 

Combine four Darkstone to make four Darkstone Bricks. 

Darkstone Bricks Slab: 

Combine three Darkstone Bricks to make six Darkstone Bricks Slabs. 

Chiseled Darkstone:

Combine two Darkstone Bricks Slabs to make Chiseled Darkstone. 

This block looks like a Phantom. 

Rituals: 

Whenever you perform a Ritual, you will get the Cursed debuff. 

To perform a Ritual, you need to interact with a Bloody Altar or Pentagram using the Ritual Book. 

Golems: 

When a Golem dies, it will drop itself as a Lifeless Golem of its type. You can use these Lifeless Golems with Infused Ashes to make a Crude Golem. 

To summon the Golems, you need to combine the Crude Golem with a Ritual Book. 

Potion Effects: 

Every tick that you have the Cursed debuff it gives you Wither and Darkness II.

Every tick that you have the Shocked debuff it gives you Slowness X and Weakness X. 

Yes, you may use this Mod in your Modpacks. 

If you do, please consider adding a link back here though. But you don't have to. 

If you do add my Mod to a Modpack, please tell me because I would love to check it out! 

Obviously, I would recomend adding this to an Occult or Magic themed Modpack, but it would also go great with a Horror Modpack or even a Fantasy Modpack.