Cold is one of the 7 elemental damage types.
Cold damage is usually the second elemental spell a mage learns, often while still on Silan. It is generally the preferred type of damage against kitin until the mage reaches level 125 and can learn the racial damage types, and in some cases even after that.
To increase your chances of resisting a Cold elemental spell, you have to wear jewelry that raises your Lakelands resistance.
Gibbaï and Stinga are both capable of casting Cold elemental spells.