Elissa's Frost Shock

This spell reduces the temperature of an area to an amount below ambient temperature equivalent to the amount it was just raised above ambient.  This rapid change in temperature can send creatures into shock.

Mimic a cantrip that deals fire damage cast within 60 feet of you since the start of your last turn. The target, saving throw type and DC, damage dealt (do not roll again, use the same damage roll from the initial fire spell), and secondary effects are duplicated, however, instead of fire damage all damage is cold damage. On a failed save the target takes full damage and is  paralyzed for 1 minute. The target can make a Constitution save equial to the caster's spell save DC at the end of each of its turns to recover. On a successful save the effect of the original spell's save effect is applied, and no paralysis, but the target is slowed until the end of its next turn. Any spell that specifically deals fire damage can be affected, and Frost Shock is always an evocation spell regardless of the school of the spell being copied. 

Alternatively this spell could be used to modify any mundane effect that is above ambient temperature within a 10 foot radius of the caster. It could be used to flash freeze hot food, turn a hot spring into an icy pool, or extinguish normal fires in the area.

Lastly, this spell may be used to inflict wounds upon creatures made of fire. The caster may target a creature with the elemental type that is fire based (Fire elementals, Magma/Steam Mephits, Salamanders, etc.) within 60 feet, which then must make a Constitution saving throw or take 2d10  cold damage and be paralyzed (save at the end of each of its turns to end) as the spell sucks the warmth from its form. On a successful save the damage is halved and the target is instead slowed until the end of its next turn. 

Additional effects may be appropriate as well depending on the spell being replicated or effect being countered as determined by the DM. For example, following up a Heat Metal spell with Frost Shock may cause metal weapons or armor to become brittle.  

AT HIGHER LEVELS:  When you cast this spell using a spell slot of second or higher, increase the level of spell mimicked by one per slot level above first.  Alternatively,  increase the area of the secondary usage by 10' radius per slot level above first. Lastly, when cast against a fire based elemental, increase the cold damage dealt by 1d10 per slot level above first.

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Example 1: Bob casts a Firebolt on the orc. He hits and rolls a 6 for damage. On her turn Elissa casts Frost Shock, the orc takes 6 cold damage, and must save or be paralyzed.

Example 2:: Bob casts a Fireball spell on 3 hill giants.  He is awesome and rolled max damage!  2 giants made their saves, and took 24 points of fire damage. The third failed and took 48. On her turn, Elissa casts Frost Shock using a 4th level spell slot at the location the fireball detonated. The creatures in the original fireball area must make a DEX save, using BOB'S save dc or take 48 cold damage. 1 Giant saves and takes 24 cold damage and is not paralyzed. the other 2 fail and take 48 cold damage, regardless of their success or failure on the fire spell. These two who failed are also paralyzed for 1 minute or until they succeed at a Constitution save at the end of one of their turns. 2 other giants have moved into the area as well, however they are not subject to the Frost Shock, as they were not affected by the original Fireball.

Example 3:  Elissa's party is fighting a Red Dragon! Unfortunately, Bob the sorcerer skipped adventurer school the day they talked about dragons and decides to toss a Scorching Ray at the dragon. he hits and rolls a total of 18 damage on his 3 rays. The fire didn't seem to affect the dragon at all though! Elissa's turn comes up and she uses a third level slot to cast Frost Shock on the target of the Scorching Ray. Since Frost Shock deals cold damage, and all of Bob's rolls hit their mark, the Red Dragon takes 18 cold damage. He then must make a con save against Elissa's spell DC or be paralyzed.