The Tyrian Sword is an energy blade that is made of purple gems. It is a late game sword with a fairly simple crafting recipe.
To craft the Tyrian Sword you will need to make two Tyrian Blades which are crafted with three purple gems each.
To complete the sword you will need two more purple gems, two Tyrian Blades, and a dark steel ingot.
The Tyrian Sword does 18 damage and has 2,300 uses. It can be repaired at an anvil with purple gems.