Affixes your rune weapon with a rune that has a chance to increase the damage by 20% of your next 2 spells that deal Frost or Shadow damage. Lasts 30 sec. Modifying your rune weapon requires a Rune Forge in Ebon Hold.
Rune of Cinderglacier is a Death Knightrune that can be inscribed on a Death Knight's weapon through [Runeforging]. Sometimes used by dual-wield frost DKs to boost their AoE damage.