Crystals

Elemental Crystals can be obtained as a rare drop from Tormented demons. These four types of crystals can be used to upgrade Elemental whips, the Elemental bow and the Elemental staff into four primary nature elements, gaining the prefix (fire), (thunder), (ice) or (nature) behind their name:

Fire crystal
Thunder crystal
Ice crystal
Nature crystal

Once upgraded with one of these crystals the weapons become upgraded and degradable, after 40000 hits it will disintegrate into either the weapon or the crystal you used to upgrade it. To upgrade a weapon with a crystal you simply use the crystal on the weapon in your inventory. Once you do, the weapon becomes the elemental upgrade and it cannot be changed until it degrades. The elemental weapons are tradeable.