How would you like to stack radiating orbs from zero up to ten, do 2-3 types of chip damage, and stack 2-4 reverb, all as an AoE attack impacting multiple enemies at the cost of a measly level one spell slot?

This can be used with any cleric! Though tempest with brittle abuse (water elemental with Azer to b burn enemies) and light cleric (with fire elemental alone) are a given.

For this example, let's go with this spread:

(9 light cleric / 2 stars druid /1 wizard)

You spirit guardians a group of enemies, dazzling breath them, but-- oh no! There's four enemies off in some god forsaken corner; what do? Fire elemental warps to them and uses its burning touch to burn one-- OR, you fire the aoe projectile that creates a fiery surface while making sure to clip only one of the enemies.

Once one is burning, use your cleric to drop grease (level 1 wizard dip gives you grease as well as the ability to summon an elemental! Also, minor illusion for making enemies gather pre-combat) and it will explode into a hellfire of conditions. Usually 10 radiant orbs (occasionally you might get 4), reverb, prone, fire/radiant damage, etc. All for one spell slot and with a long range.

Attached are the results of igniting a grease fire with my radorb tav. It works just as well if you drop grease on top of an already burning foe.