Oooh, I really like that one.-- Scrolls are not A Thing. Instead, spellcasters tattoo spells onto their flesh, the ink magically fading when the spell is called upon. Evil spellcasters have been known to skin their opponents and wear cloaks of stitched-together tattooed human skin, replacing patches as they are used.
And Claudio Pozas has already illustrated them:-- A militaristic kingdom of hobgoblins that are not "savage humanoids" but boast a civilization as proud as any in the setting. Sure, they're ruthless, antagonistic and not at all nice, and they keep slaves and oppress goblins as a servile underclass, etc. But they're not savages or barbarians. That kind of nonsense is what orcs are for. Treat them as a kind of combination of Nazi Germany and Imperial Rome.

(a cut down version of my campaign world)
A canyon, miles wide with islands floating in the air (inside it) with an everglades like swamp lands below. Where Halfling and Gnomes slavers merchants run airships from island to island and giant eagle riding pirates hunt them. In the swamp below ruins are found where serpent men and lizard men plot against all.
I admit that the concept came to me years ago after seeing his Pax Hobgoblinica work. Then the Skorne Empire of Iron Kingdoms further fired my imagination on the concept. Then reading the Legacy of Dhakaan series of novels by Don Bassingthwaite finally made it a reality. I developed the concept of a civilized hobgoblin khaganate as a modular setting element, and whipped up a few details of it on my setting wiki.And Claudio Pozas has already illustrated them:
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(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.