Delayed Blast Fireball

7th level Evocation
Casting Time
1 Action
150 Feet
Concentration, up to 1 minute
Materials Required
A tiny ball of bat guano and sulfur

Spell Description

A beam of yellow light flashes from your pointing finger, then condenses to linger at a chosen point within range as a glowing bead for the duration. When the spell ends, either because your concentration is broken or because you decide to end it, the bead blossoms with a low roar into an explosion of flame that spreads around corners. Each creature in a 20-foot-radius sphere centered on that point must make a Dexterity saving throw. A creature takes fire damage equal to the total accumulated damage on a failed save, or half as much damage on a successful one.

The spell’s base damage is 12d6. If at the end of your turn the bead has not yet detonated, the damage increases by 1d6.

If the glowing bead is touched before the interval has expired, the creature touching it must make a Dexterity saving throw. On a failed save, the spell ends immediately, causing the bead to erupt in flame. On a successful save, the creature can throw the bead up to 40 feet. When it strikes a creature or a solid object, the spell ends, and the bead explodes.

The fire damages objects in the area and ignites flammable objects that aren’t being worn or carried.

At Higher Levels. When you cast this spell using a spell slot of 8th level or higher, the base damage increases by 1d6 for each slot level above 7th.

1st 2nd 3rd 4th 5th 6th 7th 8th 9th
Damage Dice 12d6 13d6 14d6
Min Damage 12 13 14
Average Damage 42 45.5 49
Max Damage 72 78 84
Lvl Dice Min Avg Max
7th 12d6 12 42 72
8th 13d6 13 45.5 78
9th 14d6 14 49 84

Is Delayed Blast Fireball Good?

Overall Rating: Sky Blue. This means that delayed blast fireball is an amazing spell. If you do not take this spell your character would not be optimized.

Overall Notes: Seeing as you can end concentration at any time this is essentially a 7th-level fireball with upsides. If you're able to time enemies entering the radius exactly 1 minute after you cast it, the resulting damage would be massive for a 7th-level spell. Most of the time, you'll be detonating this with a d6 or two extra damage.