The Burning Earth

The Burning Earth is also known by the name of Flame Tongue Sword, is a long sword +1 with bonuses to specific enemies. Like the Moonblade, this blade is also on fire when unsheated, but this one has naturally colored flames. It has a weight of 4 lbs and a speed factor of 3 and can be wielded in one hand. The weapon falls under the large sword proficiency and as a result, clerics, druids and mages cannot wield this weapon. This blade has a +1 bonuses to damage and thaco. It does extra damage to: This powerful blade can be found in Durlag's Tower (building) at the level where the ghosts of Durlag and Islanne are in the same area where the Staff of Striking is found, it close to the treasure vault. This sword and Varscona are the best long swords available to anyone able to wield them.
 * +2 vs. regenerating creatures.
 * +3 vs. cold-using creatures, for example winter wolfs
 * +4 vs. undead, for example zombies and ghouls.

In-game description
"Flame Tongue Sword: 'The Burning Earth'. There was a time before Neverwinter was warm and before the great Anauroch was dry... or so it is said. Few relics remain to prove such an age existed, and fewer still have an identifiable purpose. "The Burning Earth" seems straightforward enough -it burns a victim with magical fire, and a cryptic rune seems to suggest that the power comes from the ground itself- but whoever constructed it remains a mystery. It looks perfectly serviceable weapon, but something in the balance is wrong or grip is... wrong. It strains the forearm a touch, and does not fit the hand just right. It doesn't seem to hurt a warrior's performance, aside from the nagging doubt that the blade was not made for him... or any other humanoid."