Arima's Fiendish Panoply

"War; it has never ceased to change in its nature. At the end of the day, the young will pay the price for it, and so what leader would I be if I wasn't at least willing to stand at the front and lead them into their doom side by side? So, sword, armor, shield; if I cannot ward them myself, then let this be the bare minimum of protection these soldiers are to be granted for their impending demise."

—Arima Homura

Whilst you aren't wearing any armor, a flash of hellfire engulfs you, before leaving you covered in a temporary set of equipment, which you still need proficiency in to use effectively. It consists of a set of half-plate, a shield, and magical longsword. Alternatively, the longsword and shield can be replaced by a singular magical glaive. Whilst wearing this gear, you have advantage on charisma based ability checks when interacting with Fiends.

It stylistically takes on any appearance that you wish to, but will always clearly resemble a full set of visible armor. When the spell ends, all the gear vanishes again.

Using a Higher-Level Spell Slot.
When you cast this spell using a spell slot of 4th level or higher, your summoned gear gains the +1 property.
When you cast this spell using a spell slot of 6th level or higher, your summoned gear gains the +2 property, and you have resistance to fire damage whilst wearing the summoned armor.
When you cast this spell using a spell slot of 8th level or higher, your summoned gear gains the +3 property, and you have immunity to fire damage whilst wearing the summoned armor.