Cyroglyph

This spell magically spreads a vial of powdered sapphire into a Cyroglyph, centered on the caster, that has a 30 feet diameter. When a being is standing on it, all attacks will also gain 2d4 Cold damage, and an extra 1d4 for each level it is cast at from Level 2. This can only apply to a reasonable (determined by the DM) number and type of attacks. For instance, if a Wizard casts Lord Billy's Stormy Skies, each raindrop wouldn't deal 2d4 cold damage.