you must go to the aether by getting the aether mod mine some purple stuff and craft it like you craft a sword
stone sword, iron sword, gold sword, and diamond sword
you cant.
you twist their sword and lick their bow
you can craft a pickaxe,sword,helmet,chest plate,boots,trousers,flint and steel,etc. More on MinecraftWiki.net
unless there is a mod for it it does not exist. (correct me if i am wrong but i dont think i am)
If you mean the enchantment then it makes the sword do more damage for all mobs. Can be really useful in the end.
Upgrade your cabin to have a crafting room, place a sword and 3 dead metal on the workbench/crafting table, click on the table, select craft, and select dead sword/axe ect.
You will need two cobblestone to create a cobblestone sword. You will also need a crafting bench, and a stick. To create place the stick at the bottom of the crafting area. Then place the to cobblestone on top.
Go to the tools section on the crafting table and press the sword.
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Sword Rock map, kill Stone Dragons