Vraloth's Icewall

The caster sprinkles gem dust in an arc. A fan of icy spikes forms rapidly from the ground, dealing 2d6 cold damage and 1d6 piercing damage to whatever is in its path as it forms. The ice is roughly 5 feet in height and length, and forms within 5 feet of the caster. The ice can be utilized as half cover, with an AC of 8 and 5 hit points. The ice lasts for 1 combat round (two rounds in cold environments) or until destroyed, whichever occurs first. The caster may modify the dimensions of the spell so that any one of its physical properties is doubled (for example, the wall has an AC of 16 or is 10 feet high), at the cost of having any damaging properties.  

At higher levels, the ice's properties enhance. Ever every spell slot level above the base level, the ice deals 1d6 additional cold damage, gains an additional 2 points of AC, and can either occupy an additional five feet of height or length, as the caster chooses.