You're a sorcerer. For your 4th level feat you took Magic Initiate: Warlock along with the first level spell Hex.
You took a potion of speed last turn, and you are wearing the Circlet of Fire.
It's your turn.
You do the following:
1. Cast Hex as a bonus action.
2. Cast Scorching Ray as an action. It makes three attacks, each doing 3d6 points of damage.
3. Cast Scorching Ray as your second action. It makes three attacks, each doing 3d6 points of damage.
4. You have a bonus action because of the fire spell. You use Quicken Spell to cast yet another Scorching Ray, making three more attacks, each again at 3d6 points of damage.
In total, you have cast three Scorching Ray spells in one turn. It's unlikely all of them hit, but assuming they did, you would have done 27d6 points worth of damage.
Now add in the Ring of Fire, adding a point of damage to each individual attack. Add in the Gloves of Flint and Steel.
Of course you're wielding the lightning charges staff, getting the damage bonus from that.
And if you really want to go nuts, put on the currently broken Poisoner Robes.
I don't think there's much in the game that can withstand that.
LOl I'm definitely going to try this.
This attack is deserving of it's own name ...there are many on here much more imaginative than me...I'd love to hear some suggestions.
I'll give it a go as best I can
Jandk's scorching apocalypse.