Skeleton Expansion is a mod that adds a bunch of skeleton related items.

Here are all things that are added in this mod:

Bone fossils:

Bone fossil generates in caves and is fairly common.

Chilled bone fossil generates in caves but only in snowy biomes.

Withered bone fossil generates in The Nether and is pretty rare.

Scorched bone fossil generates in The Nether and is pretty rare too.

Bone bricks:

Normal, Chilled, Withered and Scorched bone bricks are made using bone blocks. Chilled, Withered and Scorched bone blocks are also added.

Bone Bundles:

Normal, Chilled, Scorched and Withered bone bundles are made using bones. Now you can store even more bones!

Marrow:

Marrow is a new type of food you can craft using bones. There are 4 types of it: Normal, Cooked, Frozen and Withered.

-Marrow can be crafted using Bones. After being eaten, it gives regeneration II for 20 sec.

-Cooked Marrow can be crafted using Scorched Bones. After being eaten, it gives Fire Resistance for 20 sec.

-Frozen Marrow can be crafted using Chilled Bones. After being eaten, it gives Speed II for 20 sec.

-Withered Marrow can be crafted using Withered Bones. After being eaten, it gives Strenght II for 20 sec.

You can also cook marrow using Smoker:

Frozen Marrow-> Marrow-> Cooked Marrow-> Withered Marrow

Skeleton Changes:

Strays now drop:

+chilled bones

+stray gems

+torn fabric

-they no longer drop tipped arrows.

Wither skeletons now drop:

+withered bones

-they no longer drop coal and normal bones.

Zombie Pigman now has a chance to drop scorched bone.

New Mobs Added:

-Skeleton Cow

-Skeleton Pig

-Skeleton Spider

-Skeleton Pigman

New Items:

+Stray gem is used to make stray necklace. When worn it gives speed.

Stray gems can be made into stray gem block.

+Torn fabric can be used to make stray armor that gives speed. To make it you also need stray gem and stray necklace.

+Chilled bone meal can be used to make Ice age flower. (to make it you have to put stray bone meal and a random flower in a crafting table)

When stand on, it gives slowness.

+Scorched bone meal can be used to make Fire lily. (to make it you have to put nether bone meal and a random flower in a crafting table)

Fire lily gives you a new effect called Scorched when you walk on it.

+Scorched bone can be used to make a new weapon, Scythe. Its really strong but very slow.

+Bone rose is a new flower that spawns rarely in the nether. After walking on it, you get regeneration.

+Withered bones can be used to make quartz tools.

They are slightly better than stray gem tools but have much more durability and are faster than them.

Using wither rose, they can be turn into withered quartz tools.

They have more durability and give Wither II when attacking.

Wither bones can also be used to make withered quartz armor. Its better than iron and gives fire protection when full set is worn. It also extinguishes you.

+Withered bone meal can be used to make wither rose. (to make it you have to put wither bone meal and a random flower in a crafting table)

Withered bone meal can be used to make black dye.

New biome:

-Boney Wastes:

This biome is filled with bones and you can find here lots of skeleton mobs.

You can find here giant skulls, bones and skeleton temples.

If you have any suggestions you want to see in this mod, tell me in the comments and i'll try to add it in.