Absolute Zero

You create a powerful blizzard in a 30-foot radius around you, condensing icy energy into yourself; this area is considered difficult terrain made of ice. When the spell ends, whether because your concentration was broken or because you chose to end it, you release all the concentrated energy in an explosion of ice that spreads outward. Each creature within a 30-foot radius of you must make a Dexterity saving throw. On a failure, it takes glacial damage equal to the total accumulated damage, has its speed halved for the next minute, and can’t take reactions. On a success, it takes only half the damage.

A creature that failed the saving throw can take either its action or its bonus action, but not both.

The spell’s base damage is 12d6. If your concentration isn’t broken by the end of your turn, the damage increases by 1d6.

At Higher Levels. When you cast this spell by spending Mana points equal to an 8th-level spell or higher, the base damage increases by 1d6 for each level above 7th.