Runestone Scimitar

The Runestone Scimitar is a post-Plantera weapon that can be crafted from: As you can tell, this weapon would be easy to make if it weren't for the Enchanted Sword that is required, which isn't even a guaranteed spawn in your world.
 * 1 Enchanted Sword
 * 15 Ectoplasm
 * 20 Crimstone/Ebonstone

And now, for the stats:
 * 95 Melee Damage

This weapon's special feature is that for each enemy killed, you regain 40 HP, in a similar manner to Spectre Armor healing:
 * 12% Critical Strike Chance
 * Very Fast Speed
 * Tooltip: 'Consumes the souls of defeated enemies'

When an enemy is defeated by this weapon, a long white bolt will fly towards your character and heal you as soon as it touches you.

The best Modifier this weapon can achieve is Legendary.