The Magmatic Long Sword is a Superhardmode sword.
It has 49 Base damage,11% Critical strike, Very fast attack speed and an Average Knockback.
Of note: this weapon is required to make the Elemental Excalibur, the final sword in Avalon.
It will NOT automatically swing when the attack key is held down.
To craft it requires: 35 Magmatic Bars, 15 Soul of Fright, 5 Soul of Fire and 10 Fire Shards at an Adamantite Anvil.