Aegir’s Diamond Dust

As you begin concentration, you summon the full force of winter. The area within a 60ft emanation of you becomes a frozen wasteland as even the very air freezes under your command. Creatures that start their turn in this area must make a constitution saving throw or take 1d12 cold damage. Additionally creatures that fail this save gain the Frozen condition. For each creature that fails the saving throw you gain 5 temporary hit points which last for the duration of this spell. You may choose to drop concentration on this spell early forcing the ice to shatter painfully around all creatures except yourself. Each creature within the spells radius must make a constitution saving throw or take 8d12+40 cold damage and gain the Jinxed (1d6) condition until the end of your next turn.

Creatures that are Jinxed in this way bear the mark of your magic. For the next minute you may choose a number of creature up to your spell casting modifier to become conduits. When you cast a spell that deals cold damage, your conduit delivers the spell as if it had cast the spell. Your conduit must be within 100 feet of you, and it must use its reaction to deliver the spell when you cast it. If the spell requires an attack roll, you use your attack modifier for the roll.