When creating a world, a "Withered Grass Block" will spawn in place of a regular grass block. Every once in a while the withering effect will spread to nearby blocks and will result in the world slowly withering away. Mobs that enter the spreading biome will get sick and rarely turn into withered variants of their original self, causing them to be hostile to the player and give the wither effect. No blocks disappear, but the color on them will fade. Affected flowers will turn into wither roses. Deserts will turn grey and the cacti could turn into a dull shade of blue or purple. The spread can be stopped through walls and splash potions of regeneration, which will revert the area in the splash radius to normal permanently.
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