Blade of Pure Ice

Blade of Pure Ice

You touch one weapon of your choice and it turns into solid ice. Any attacks made with the weapon do an extra 1d4 cold damage, and the weapon melts back into its original state after 10 minutes. You can use this ability once per day. The damage increases to 1d6 at 7th level, 1d8 at 13th level, and 1d12 at 17th level.