Torretas

testfor @e[type=Item] {OnGround:1b,Item:{id:minecraft:brewing_stand,tag:{display:{Name:Torreta}}}}

setblock ~ ~ ~-3 redstone_block

/summon Silverfish ~ ~1 ~ {CustomName:torazul,Invulnerable:0,Attributes:[{Name:generic.movementSpeed,Base:0.00001}],ActiveEffects:[{Id:14,Amplifier:1,Duration:20000,Ambient:1}]}

execute @e[type=Item] ~ ~ ~ summon Chicken ~ ~5 ~ {CustomName:torazul1,Invulnerable:0,Attributes:[{Name:generic.movementSpeed,Base:0.00001}],ActiveEffects:[{Id:14,Amplifier:14,Duration:20000,Ambient:1}]}

/particle portal ~ ~1 ~ 1 1 1 0.01 500 @e[name=torazul1]

execute @e[name=torazul1] ~ ~ ~ effect @p[r=3] 1 1 10 true

testfor @e[name=torazul1]

kill @e[name=torazul1]

tp @e[type=Silverfish] @e[type=Item,c=-1]

execute @e[name=torazul] ~ ~ ~ fill ~ ~ ~ ~ ~1 ~ brewing_stand