Magicka Serella
3-level Conjuration
You cause a 5-foot diameter patch of brown mold to appear at a point you can touch. 12 Whenever a creature moves within 5 feet of the mold for the first time or starts its turn there, is must make a DC 12 Constitution saving throw, taking 3d10 cold damage on a failed save, and half as much damage on a successful one. You can make a melee spell attack to cause it to appear on a creature. On a hit, the creature must make a successful Constitution saving throw against your spell save DC, taking 4d10 cold damage on a failed save, and half as much damage on a successful one. As described on p. 105 of the Dungeon Master's Guide, if any source of fire is brought within 5 feet of a patch of brown mold, it immediately doubles in size. A patch of brown mold exposed to any effect which causes cold damage is immediately destroyed.