An ancient staff made of the darkest of ebony. Its head cradles a gem that possesses a chilling aura that could destroy all but the most magic resistant Humans. One who is skilled in the use of magical items may be able to harness this chilling aura's power.
The Numbing Chill spell is a very minor cold vuln spell that will surpass all regular cold vuln spells level I - VII, thus making you immune to cold vulns. Level 8 surpasses this spell.
The frost wave spell only fires in a straight line, and must be cast from a distance to be effective. Also the spell only reaches about half a radar length and any opponents that block the way will be hit instead of your target... this also means you must make sure the way is clear before casting the spell.
The spell requires a lot of mana to cast, a mage with high mana conversion will likely get 5-7 casts before requiring a manastone.