Epic wither boss battles!!! (spawner is in command single boss in the description) by nicosaurusrex99

Single mob

/setblock ~ ~1 ~ minecraft:mob_spawner 0 replace {Equipment:[{},{},{},{},{id:"sticky_piston",damage:0,ench:[{id:7,lvl:9001}],SkullOwner:"NicosaurusRex99",CustomName:"Jeff",Levels:9000000000000000000,display:{Name:"1v1 me on twitter"},Count:1}],CustomNameVisible:1,AbsorptionAmount:8701,CustomName:"1v1 me on twitter",DropChances:[2f,2f,2f,2f,2f],NoAI:1,SkeletonType:0,IsChickenJockey:1,ExplosionPower:9001,DisplayOffset:27,Command:"summon Sheep",ActiveEffects:[{Id:15,Amplifier:100,Duration:100,ShowParticles:1b},{Id:19,Amplifier:1000,Duration:9001,ShowParticles:1b}],spawnCount:16,spawnRange:32,delay:4,minSpawnDelay:20,maxSpawnDelay:20,EntityId:"WitherBoss",SpawnData:{}}