Transient Mercury

Transmute up to one handful of mercury on touch to any element below the weight of bromine on the periodic table. Mass carries over so that the mass cannot exceed the sum of the mass of mercury. Since mercury is pretty dense, the volume of the created object would usually be larger than the volume of the mercury. At the fourth level, the element created will be in its room temperature state and must be heated or cooled to change states. At level six, the caster can heat a solid substance into a liquid and turn galium or mercury into a solid for the spell's duration. At the 8th level, the allowed possible elements includes any element lighter than cadmium. At the 12th level, the user can turn the mercury into a gas that will immediately fill small rooms, lingering for 4 turns, and quickly dissipate outdoors over the course of two turns. After this point, the mercury will cool back to its liquid state and accumulate over the affected area. Mercury gas is both colorless and odorless and inflicts poison upon anyone in the area. At the 16th level, the user can now create any element lighter than metal. At the 20th level, the user becomes a master of mercurial transmutation and can bring all created elements to their freezing point as well as their boiling point, allowing any element to exist in any state. However, gasses may only remain solid for a single turn before vaporizing and solids can only remain gaseous for one turn before becoming liquid for one turn and then finally solidifying. Once the spell is broken or one hour has passed, the created elements will become mercury again, appearing in place of wherever the created element was.