Minecraft wiki entry for Defeating_a_woodland_mansion, associated text: To move the sheep around, either hold wheat to make it follow you or use a lead if you have one. When you see an evoker you can bring the blue sheep and your blue dyes to the evoker. Make sure you dye your sheep blue before you approach the evoker, as it sees a normal sheep it might do a fang attack instead, hurting both you and your sheep. If the evoker sees the blue sheep it will dye it red, giving you time to dye the sheep blue again and hit the evoker a couple times while it is still on its cooldown.