Wither Was once Human he was the greatest scientist in all of minecraft but soon after the nether was discovered and him and his team of Researchers decided to explore the nether, they found lots of new mobs and blocks that was used for research but a particular block caught Wither's eye it was none other than the wither rose a rose that could slowly kill an entity rotting them from within, but he didn't know that and took the rose He was able to extract the flowers essence and called it the potion of decay and it Had devastating effects Wither decided to share