Guaranteed Mob Drops (GMD) is a small mod that adds a few items and crafting recipes, these items are dropped by specific mobs and can be combined to form that mob's full drop. The small items dropped by these mobs are guaranteed to drop, and you combine them by placing 4 spread out in a 2x2 area of the crafting grid.
The mobs and their drops are as follow:
Blaze - Blaze Rod Piece
Skeleton - Bone Marrow
Enderman - Ender Pearl Piece
Creeper - Gunpowder Scraps
Spider - Loose String
Magma Cube - Magma Cream Piece / Slime Bits
Slime - Slime Bits
However, there are 2 other mobs that drop items that cannot directly be turned into their full counterparts, those are:
Wither Skeleton - Withered Bone
Wither - Nether Star Chunk
The Withered Bone and Nether Star Chunk are used to craft a full Nether Star, like so:
