only applies in hard difficulty.
1 - Mobs spawn with better gear more often.
2 - Mobs can spawn with potion effects.
3 - Creepers always spawn with speed.
4 - Skeleton archers have poisonous arrows.
5 - Skeleton warriors can spawn in the world (Basically skeletons with swords).
6 - spiders apply slowness.
7 - Monsters can spawn with more health.
8 - Skeletons can call reinforcements (Other skeletons) to their aid.
9 - Zombies can call reinforcements (Other zombies) to their aid.
10 - Slightly Increased spawns.

