Start your quest for the Chaos Runes and be rewarded with the Ancient Chaos Frost spell.

Read more here:
http://thedruidsgrove.org/forums/showthread.php?p=141022#post141022
For this quest you will need to obtain a rune called "Chaos Runes" and Return it to Reyfin Malakwa in the Abysmal Sea at loc +227, +283, +98. This has been found in 2 zones so far, Inktu'ta, and Qvic