The Orb Of Sovilus

When this spell is cast, you create a small, apple sized orb of solid blue ice, this orb is crystal clear and cold to the touch. For the duration of this spell, the orb counts as an arcane focus for the purposes of spell casting, further more, at any time a spell that causes cold damage is cast using this orb, that spell deals an additional +1 cold damage.

At any time during the duration of this spell, you may throw the orb at one creature within range. Make a ranged spell attack against the target. On a hit, the target takes 1d10 cold damage. Hit or miss, the orb then explodes. The target and each creature within 5 feet of it must succeed on a Dexterity saving throw or take 3d6 cold damage. Once the orb has been used in this way, it is destroyed and the spell ends.

At Higher Levels. When you cast this spell using a 6th level spell slot, the cold damage increases to 6d6 and the bonus increase to +2, when you cast this spell using a 9th level spell slot, the cold damage increases to 9d6 and the bonus increases to +3.