Alright do you have a hatred for a faction unit and you simply do not want to kill him/her easily and want to kill him/her in style or you want to use it for decortions? Well this is the suggestion for you.
Guillotine
Now i do not have any clear name for this but I would like to call it the table chopper. If the enemy surrenders you can bind them to chains or you use a rope and bring them to the chamber and then you can execute them.Quick Note : the rope can only work on NPC not players. Another Note : NPC can escape from ropes.
Another Note : If an enemy surrenders you are not meant to kill him however this is a option.
Noose
This is called a Hang rope you can hang enemies by binding them to chains and bringing them to the chamber and right clicking it. Once you have place him/her in the chamber he/she will have their necks broke.Crafting
Guillotine,: 3 wood planks and 3 iron
Noose : One rope and 3 wood planks.
Rope : 3 leads and 3 slime balls.
Chains : 8 Iron rings.
Durability
Noose : 240
Guillotine : 360
Chains : 500
Rope : 250
Any constructive criticism is appreciated!