I would say the last line. " If you choose, plant life in the area is unaffected by this spell." makes it more druidic or Nature domain cleric.

Then why do sorcerers have it as well?

Quote from Princedg5678 >>

Then why do sorcerers have it as well?

 Good question.  Maybe because a lot of sorcery is tied to draconic bloodlines?  Really, I have no idea other than "Because WOTC said so..."

Quote from Trewill91 >>

And by the way, 7th level fireball and firestorm actually do the same average damage, at 38.5 fire damage, you're just more likely to roll near that average damage with fireball because you're rolling more dice.

Quote from yogg_saron >>

7th level fireball would do 12d6 = 72+12=84 84/2= 42 avarage

firestorm 7thlevel 7d10 = 70+7=77 77/2=38,5 so fireball does more but in a way smaller area

Just want to chime in and say Trewill was correct about the averages for these spells. A 7th level Fireball does 11d6, with an average of 11*3.5=38.5. Firestorm does 7d10, with an average of 7*5.5=38.5. The only difference (in damage) is that Firestorm is more swingy.

Firestorm is still better just for having a larger area, and much more control of its shape. If you only care about 2 dimensions (which is usually the case), Firestorm covers 1000sqft, and Fireball covers 400sqft. (If you use more realistic measurements, the area of Fireball is even smaller, but Firestorm is unaffected.)

Quote from Princedg5678 >>

Why isn't this a wizard spell?

 

Wizards already got like 300 spells for raining down fiery destruction on whomever they like....
and the biggest spell list......
and highest amount of class-restricted spells.....

I'm sure they can let some other casters have this one spell.

If a caster in my party wanted to have all cubes affect one creature I would just make them use 16 spell slots worth of magic, take 50 necrotic damage that can’t be reduced (from channeling a stupid amount of power) and just call it a day.

If a huge creature is in two of the squares, would you rule that it has to make two dexterity saves, or only one? And should it take the damage twice?

Do the rar

If a huge creature is in two of the squares, would you rule that it has to make two dexterity saves, or only one? And should it take the damage twice?

The damage isn't per cube, it's for the entire area, so only one save per creature. The cubes only determin the shape of the area.

On a medium or smaller target, sure, you couldn't. However, the spell says nothing about creating 2 stacks of 5 cubes, each dealing 35d10 damage to one side of a large or larger creature.

Fireball has a larger AOE: pi*20^2 is about 1257 square feet while firestorm has 1000 square feet. Fireball also deals more damage 12d6 = 42 on average while fire storm deals 38.5.

Fireball is better than firestorm.

However... the firestorm can change the shape of its range so you could center it onto an enemy and hit another enemy that is 100 away! This means that while it covers a area of 1000 feet it has effectively covers about 31416 square feet. You can also hit a target from 250 ft away.

Fire ball but more targets.

Imagine someone casting it on an Iron Golem that the party is about to kill, lol.

"Each cube must have at least one face adjacent to the face of another cube."

So like a Tetris pattern of selected enemies. Cubes side-by-side.

It doesnt sound like the cubes stack in the same area. Or if a stacked cube could happen, it would be verticle and too far away from its target (assuming the cube takes up space).

Benefit over fireball? You choose the path of fire, and can avoid allies easier. + Flavour.

Quite good. No materials required and you can choose the shape of the storm.

Quote from Dracis >>

This on a Tempest cleric with metamagic adept feat taking transmuted spell option. Change the fire to lightning or thunder, max the 7d10 with your channel divinity, in ten cubes thats a combined total of 700 lightning or thunder damage.

And im out.

 Congrats! The tarrasqe is dead.😵!!

Can you just make a wall of cubes

Quote from benwilliams1004 >>

Can you just make a wall of cubes

Sure! You can stack them on top of each other or next to each or whatever as long as each one is adjacent face-to-face with another one.

Quote from brokenphantasm >>

So, just for clarification, if I use it on a large or larger creature I would do 7d10 x the number of cubes on that creature. Thanks for the reply.

 so a gargantuan creature could potentially take 28d10 (average:154)  fire damage?

Quote from BeK2847 >>

Quote from brokenphantasm >>

So, just for clarification, if I use it on a large or larger creature I would do 7d10 x the number of cubes on that creature. Thanks for the reply.

 so a gargantuan creature could potentially take 28d10 (average:154)  fire damage?

 or, if the gargantuan creature is in the center of one cube, since it reaches out into 8 other cubes, 63d10 (average:346) fire damage? it seems to overpowered.