There are a bunch of magic items in Dragon Magazine #91, some are hit and miss, not sure if all of them are worth converting. The Gauntlets of Heat were originally by David Baldwin. Each of the spell abilities were originally usable a certain number of times per day, but I based it on the Staff of Fire. Produce flame and heat metal are druid spells, and heat metal is on the bard’s list as well, so I restricted attunement to those classes. I also use elementalist wizards and sorcerers, so I opened attunement up to them as well.
One of the abilities, flame arrow, is not a 5e spell, so I updated the 3.5e version. I’m adding it to my ranger, sorcerer, and wizard spell lists. I’m on the fence about the “at higher levels” portion. That’s an additional 10d6 worth of damage for each spell slot, which is a lot. Of course, I’m picturing using this to ignite 1 arrow each of a unit of archers in a mass battle as the initial shot in an attack, with each requiring a hit roll and not targeting the same thing. With the short duration, it’s not reasonable for a single archer to go through all of them before duration expires.
The gauntlets regain 1d6 + 4 expended charges each day at dawn. However, if you expend the last charge, roll a d20. On a 1, the gauntlets blacken, crumbles into cinders, and is destroyed.
At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, you can effect an additional 10 arrows for every spell slot above 3rd.