This is the command that summon each 50 health stacking armored zombies with powerful loot on it but just survived from that.
Get the rules here:
1. /gamerule doMobSpawning true /gamerule doDaylightCycle true /gamerule doMobLoot true /gamerule keepInventory (your choice i don't responsible for items lost)
2. Set time to night and wait for some monsters to spawn (make sure you set difficulty to at least easy and lock it.)
3. /give @p minecraft:command_block and place the command in.
4. Give yourself at least a set of iron armour, an infinity bow, arrows and a diamond sword(P/s: Recommended using this sword: /give @a minecraft:diamond_sword 1 0 {AttributeModifiers:[{AttributeName:"generic.attackSpeed",Name:"generic.attackSpeed",Amount:1248,Operation:0,UUIDLeast:758815,UUIDMost:121108,Slot:"mainhand"}],Unbreakable:1}
5. Check whether if the command block above has a block. If yes, please remove it because the mob will fall on nearly 30 blocks tall from the command block. Then, give yourself a redstone block then switch to /gamemode s if you haven't do that.
6.Activate the command
7. Defeat it and get good loot.
8. Have fun and stay tuned for another series!
9.Remember that holding every loot from the zombie I created could get powerful effects, if you just regconize as a regular things, that's your problem.)