Biome: The wasteland biome comes in four variations: Dry Wastelands,Wastelands,Dry Wastelands M,Wastelands M. The difference between them are:
1.The wastelands and wastelands M contains vegetation, trees and grass. The others are mainly dirt and contain none of these.
2. Passive mobs and horses spawn in normal and M versions.
3. You can't place snow golems in Dry Wastelands.
4. Shrubs spawn in the Dry Wastelands
Both biomes contain structures like:
Ruins: A remains of a house that exploded/burned.
Village ruins: A village that was destroyed. The destroyed buildings are made of Cobblestone and Moss stone.
Tents (See below)
Mobs (exclusive to biome):
Survivor: A player-shaped person that spawns in tents. He trades for food, weapons and armor. In return he'll give you coal,Iron,Diamonds or Emeralds.
He/She will attack ALL hostile mobs, even creepers. They can use bows,swords and axes. They'll also attack each mob differently, using bows for skeletons and creepers and melee for anything else. The wool tents contains a crafting bench,glowstone and fences.
Buffalo: Practically a cow, but differently textured.
This suggestion is open to expand on by others, in fact, I encourage it.
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I'm Canadian, and there is no igloos around. Or snow. Or polar bears. Or moose because I live in a city, but there are moose in the country.
The survivor idea thrown in there may be a bit much... sort of like a villager on steroids... that would definitely warrant a new MOB type, however, if it were implemented (spawn like witches, trades like villagers, is neutral until attacked, fights MOB's like a golem, but can use bows like skeletons, and will shoot creepers at range.
I suppose if it is killed by a zombie, he could come back as a new zombie type... maybe a 'Scavenger'... much more deadly than your typical zombie, armored and armed with both bow and sword.
Eliminating grass spread from this biome would be awkward from a coding and a play-ability perspective... but att he same time, you would want to avoid an easy spread of lush green grass...
Grass in this area could just be brown and withered, but otherwise spreads normally.
A new 'dirt' block could be added that has it's own top that is appropriate for this biome, but spreads like grass/mycelium blocks, and competes for dirt resources, tilling this ground goes to a dirt block before it goes to tilled dirt.
Dirt blocks in this region are replaced with some sort of infertile dirt blocks that cannot be tilled, and they will not change their block ID to either Grass block or Mycelium block for an adjacent spread.
Just use sand, or clay or hardened clay for the surface layer.
Instead of stating that snow golems can't be spawned in dry wastelands, maybe instead they take damage until destroyed while they are in a wasteland biome... this will account for snow golems wandering in from another biome.