Elemental Sword

Description
The Elemental Sword has a blade whose top half resembles ice and the bottom half, fire. Unlike the Fiery Dragon Sword, Icy Dragon Sword or Fiery Gladius, however, the "fire" and "ice" are not animated. Also, since it has no fixed elemental sword hilt, this means it can be upgraded with another hilt.

Location
This sword is an extraordinarily rare drop from various chests and monsters in some areas of Nightfall and GW:EN. Seriously, though, they're so maddeningly rare a drop that you be better off coughing up the 200k and just buying one. Trust me on this one.

Nightfall Campaign
 * The Desolation
 * Monsters
 * Graven Monolith
 * Sandstorm Crag
 * Shambling Mesa
 * Joko's Domain
 * Ravenous Mandragor (only during "A Deal's a Deal")
 * Poisoned Outcrops
 * Ancient Elonian Chest
 * Locked Chest in Hard Mode
 * Diamond Djinn
 * The Ruptured Heart
 * Locked Chest in Hard Mode
 * The Shattered Ravines
 * Locked Chest in Hard Mode
 * Bladed Dune Termites in Hard Mode
 * The Sulfurous Wastes
 * Ancient Elonian Chest
 * Locked Chest in Hard Mode
 * Diamond Djinn
 * Mandragor Terrors in Hard Mode
 * Ravenous Mandragors in Hard Mode
 * Graven Monoliths (during "A Show of Force" in Hard Mode)
 * Realm of Torment
 * Domain of Secrets
 * Locked Chest in Hard Mode

Eye of the North Expansion
 * Dungeons - reward chests and Locked Chests
 * Arachni's Haunt
 * Locked Chest
 * Bloodstone Caves (Eldritch Chest)
 * Cathedral of Flames (Murakai's Chest)
 * Darkrime Delves (Havok's Chest)
 * Ooze Pit (Prismatic Chest)
 * Raven's Point (Destroyer Chest)
 * Sepulchre of Dragrimmar (Dragrimmar Chest)
 * Locked Chest
 * Slavers' Exile
 * Forgewight (Dungeon) (Forgewight's Chest)
 * Duncan the Black (Dungeon) (Hierophant's Chest)
 * Tarnished Coast
 * Arbor Bay
 * Locked Chest

Core
 * Hall of Heroes
 * Chest

Dye
This sword cannot be dyed.

Trivia

 * Bears a resemblance to the Artifact/Equipment card "Sword of Fire and Ice" from the Magic: The Gathering trading card game.