If you want to convince those feckless players of your ineffable majesty and not let them see all the smudged biro notes about goblins, you should consider purchasing the official DIE RPG Gamesmaster's Screen. The front side is all Stephanie Hans, with a triptych of three original art pieces featuring a moody armored hand, a mysterious tattooed hand, and the conflagration of possibility that lies within your soul (represented here by a flaming D20).

The back is all Kieron Gillen, and as well as the standard rules summary you`d expect to find on any GM screen, there's also: D20 motivations for NPCs so players can manipulate and exploit them, Prompts designed to engage every class at the table, Omens of Doom with which to threaten the players, A grab-bag of adversary stats, in case you need to have a fight on short notice, Lists of Standard Fantasy Tropes and Standard Real-World Tropes you can combine ad-hoc to look like a creative genius. As of the 2024 printing, it's got all the rules, even the optional, additional ones.