Thorny Plains (New biome)

The thorny plains would be a kind of desolate, dead place. Not a lot of mobs spawn there, due to its harsh environment. The biome would mostly consist of large flat areas with brownish grassblocks and darkbrown thorny grass (A grass block that deals a little damage on contact) and a few oak trees.

In the biome, only a few unique mobs spawn. These are:

Armored Hog: A passive thick-skinned pig adjusted to the thorny grass. Has health equal to a hoglin. On death, drops 0-1 leather and 0-3 pork.

Armadillo: An armadillo. Passive mob. When hit, curls into a ball, doubling its armor. On death, drops 0-2 armadillo shells.

Thorny Bones: A dirty skeleton with thorns growing on it. Has thorns effect. Other features are similar to a normal skeleton. On death, drops 0-2 bones, 0-2 arrows, 0-1 bow and 0-1 thorn.

Each of these mobs are immune to the thorny grass. 

The armadillo shells can be crafted into armadillo boots (gives immunity to damage dealing blocks, like magma and thorny grass). Durability is equal to a turtle shell. Armor value is equal to iron boots.

Combine 3 thorns with a piece of leather armor to make the armor into thorny leather armor (gives a small thorns effect). Armor value doesn't change.