Zivarn is a toa of ice who was placed to guard a special underground fortress of the Hand of Artahka. Only he and Shadow Stealer knows the fortress even exist. The fortress was created to guard certain artifacts the hand deemed were dangerous and needed to be destroyed. though the hand was disbanded before the artifacts were destroyed so the fortress is still there 15 miles below the surface of the silver sea. zivarn is still guarding the fortress. he has had to stop several intruders seeking the location. during his time at the fortress he has mastered his control over ice To the point he could defeat helryx in battle. he has added extra contents to the fortress such as traps and other things. he has not been to the surface in over 97,000 years. he has surprisingly created him self a garden with which he has planted bula trees so that he has a source of nourishment.
Zivarn wields 2 weapons both that were given to him by Artahka himself. he wields a Nynrah ghost blaster that can fire bolts of energy that can cause anyone hit by it to lose all knowledge of the fortress. his other weapon his a staff that amplifies his natural ice powers but can also be used for an offensive weapon.
He wears a mask of X-Ray vision in the shape of a noble ruru.
SIDE NOTE: the fortress is a mere legend among the beings in the matoran universe and thus no one knows it actually exists. the reason shadow stealer has not revealed the location of the fortress to the shadowed one because he feels those weapons should have never existed. he trusts that zivarn is doing a good job of guarding it. he still occasionally finds artifacts that he deems dangerous and send them to the fortress.