The Nether Overlord Boss

summon falling_block ~ ~1 ~ {Block:stone,Time:1,Passengers:[{id:falling_block,Block:redstone_block,Time:1,Passengers:[{id:falling_block,Block:activator_rail,Time:1,Passengers:[{id:commandblock_minecart,Command:gamerule commandBlockOutput false},{id:commandblock_minecart,Command:fill ~2 ~-3 ~-2 ~8 ~-1 ~2 stained_hardened_clay 4 hollow},{id:commandblock_minecart,Command:fill ~2 ~-2 ~-2 ~8 ~-2 ~2 stained_glass 12 0 stained_hardened_clay},{id:commandblock_minecart,Command:/scoreboard objectives add netherTime dummy},{id:commandblock_minecart,Command:setblock ~1 ~-2 ~ wall_sign 4 0 {Text1:"{\\\"text\\\":\\\"Destroy\\\",\\\"color\\\":\\\"dark_red\\\",\\\"bold\\\":true}",Text2:"{\\\"text\\\":\\\"\\\"}",Text3:"{\\\"text\\\":\\\"\\\"}",Text4:"{\\\"text\\\":\\\"\\\",\\\"clickEvent\\\":{\\\"action\\\":\\\"run_command\\\",\\\"value\\\":\\\"fill ~ ~-1 ~-2 ~7 ~1 ~2 air\\\"}}"}},{id:commandblock_minecart,Command:fill ~3 ~-2 ~-1 ~7 ~-2 ~1 chain_command_block 5},{id:commandblock_minecart,Command:setblock ~3 ~-2 ~ chain_command_block 3},{id:commandblock_minecart,Command:fill ~7 ~-2 ~ ~4 ~-2 ~ chain_command_block 4},{id:commandblock_minecart,Command:setblock ~7 ~-2 ~-1 chain_command_block 3},{id:commandblock_minecart,Command:setblock ~3 ~-2 ~-1 repeating_command_block 5},{id:commandblock_minecart,Command:blockdata ~3 ~-2 ~1 {auto:1,Command:/scoreboard players set @e[tag=netherOverlord,score_netherTime_min=100] netherTime 0}},{id:commandblock_minecart,Command:blockdata ~3 ~-2 ~ {auto:1,Command:"/execute @e[tag=netherOverlord] ~ ~ ~ execute @e[score_netherTime_min=50,score_netherTime=50] ~ ~ ~ summon wither_skeleton ~ ~1 ~ {CustomName:\\\"Nether Overlord's Subject\\\",CustomNameVisible:1,Attributes:[{Name:generic.maxHealth,Base:25}],Fire:1}"}},{id:commandblock_minecart,Command:blockdata ~4 ~-2 ~ {auto:1,Command:"/execute @e[tag=netherOverlord] ~ ~ ~ execute @e[score_netherTime_min=50,score_netherTime=50] ~ ~ ~ tellraw @a [\\\"\\\",{\\\"text\\\":\\\"[The Nether Overlord] \\\",\\\"color\\\":\\\"dark_red\\\"},{\\\"text\\\":\\\"Come, my loyal minions!\\\",\\\"bold\\\":true,\\\"color\\\":\\\"dark_red\\\"}]"}},{id:commandblock_minecart,Command:blockdata ~5 ~-2 ~ {auto:1,Command:/scoreboard players add @e[tag=netherOverlord] netherTime 1}},{id:commandblock_minecart,Command:blockdata ~6 ~-2 ~ {auto:1,Command:/execute @e[tag=killItem] ~ ~ ~ kill @e[tag=netherbrick,r=1]}},{id:commandblock_minecart,Command:blockdata ~7 ~-2 ~ {auto:1,Command:/execute @e[tag=killItem] ~ ~ ~ kill @e[tag=witherskeletonskull,r=1]}},{id:commandblock_minecart,Command:blockdata ~7 ~-2 ~-1 {auto:1,Command:/execute @e[tag=killItem] ~ ~ ~ kill @e[tag=blazerod,r=1]}},{id:commandblock_minecart,Command:blockdata ~6 ~-2 ~-1 {auto:1,Command:"/execute @e[tag=blazerod] ~ ~ ~ execute @e[tag=witherskeletonskull,r=1] ~ ~ ~ execute @e[tag=netherbrick,r=1] ~ ~ ~ summon item ~ ~1 ~ {Item:{id:spawn_egg,Damage:61s,Count:1b,tag:{EntityTag:{id:\\\"minecraft:wither_skeleton\\\",CustomName:\\\"The Nether Overlord\\\",CustomNameVisible:1,Tags:[\\\"netherOverlord\\\"],ArmorItems:[{id:golden_boots,Count:1b,tag:{Unbreakable:1,display:{Name:\\\"The Nether Overlord\\\",Lore:[This summons the great Nether Overlord, who has conquered dimensions.],Name:\\\"The Nether's Gauntlets\\\",Lore:[These gauntlets were forged to defend the Nether Overlord in battle, and to make him look stylish in front of a crowd of Zombie Pigmen and Wither Skeletons.]},ench:[{id:0,lvl:5},{id:1,lvl:127},{id:7,lvl:3},{id:70,lvl:127}]}},{id:golden_leggings,Count:1b,tag:{Unbreakable:1,display:{Name:\\\"The Nether's Legs\\\",Lore:[These prosthetic legs were made from stolen human technology from the Overworld, which the Nether Overlord has conquered a part of.]},ench:[{id:0,lvl:5},{id:1,lvl:127},{id:7,lvl:3},{id:70,lvl:127}]}},{id:golden_chestplate,Count:1b,tag:{Unbreakable:1,display:{Name:\\\"The Nether's Armor\\\",Lore:[Forged in the Nether by hard workers that served the Nether Overlord, this was made out of only the finest Nether Brick and Glowstone.]},ench:[{id:0,lvl:5},{id:1,lvl:127},{id:7,lvl:3},{id:70,lvl:127}]}},{id:golden_helmet,Count:1b,tag:{Unbreakable:1,display:{Name:\\\"The Nether's Helm\\\",Lore:[This trusty helm was forged out of only the finest Glowstone from the Nether for the Nether Overlord]},ench:[{id:0,lvl:5},{id:1,lvl:127},{id:7,lvl:3},{id:70,lvl:127}]}}],HandItems:[{id:golden_sword,Count:0b,tag:{Unbreakable:1,ench:[{id:16,lvl:10},{id:19,lvl:3},{id:20,lvl:2},{id:70,lvl:127}]}},{id:golden_sword,Count:1b,tag:{Unbreakable:1,display:{Name:\\\"The Nether's Hand\\\",Lore:[Forged on the legendary Aether forges, this sword was stolen by the Nether Overlord's subjects to bring back to him.]},ench:[{id:16,lvl:10},{id:17,lvl:10},{id:18,lvl:10},{id:19,lvl:3},{id:20,lvl:2},{id:21,lvl:127},{id:70,lvl:127}]}}],ArmorDropChances:[2.0F,2.0F,2.0F,2.0F],HandDropChances:[-327.67F,2.0F],Attributes:[{Name:generic.maxHealth,Base:350},{Name:generic.attackDamage,Base:15},{Name:generic.knockbackResistance,Base:1.0},{Name:generic.armor,Base:10}],PersistenceRequired:1,Fire:1,Glowing:1b,LeftHanded:1}}},Tags:[\\\"killItem\\\"]}"}},{id:commandblock_minecart,Command:blockdata ~5 ~-2 ~-1 {auto:1,Command:"/scoreboard players tag @e[type=Item] add netherbrick {Item:{id:\\\"minecraft:nether_brick\\\",Count:1b},OnGround:1b}"}},{id:commandblock_minecart,Command:blockdata ~4 ~-2 ~-1 {auto:1,Command:"/scoreboard players tag @e[type=Item] add witherskeletonskull {Item:{id:\\\"minecraft:skull\\\",Damage:1s,Count:1b},OnGround:1b}"}},{id:commandblock_minecart,Command:blockdata ~3 ~-2 ~-1 {auto:1,Command:"/scoreboard players tag @e[type=Item] add blazerod {Item:{id:\\\"minecraft:blaze_rod\\\",Count:1b},OnGround:1b}"}},{id:commandblock_minecart,Command:setblock ~ ~ ~1 command_block 0 0 {Command:fill ~ ~-3 ~-1 ~ ~ ~ air}},{id:commandblock_minecart,Command:setblock ~ ~-1 ~1 redstone_block},{id:commandblock_minecart,Command:kill @e[type=commandblock_minecart,r=1]}]}]}]}