There are some material covered in the Feywild in the Dungeon Master’s Guide but very little about the behavior and social structures within it. I’m sure that Wizards will touch on this subject matter in later supplements, but the lack of material can seem distressing especially for DMs when most players interact with undead, fiends, and evil humanoids and monstrosities. There were some supplements during 4th Edition that expanded and explored more about the Eladrin and the Feywild. Storm King’s Thunder expanded and accentuated the Ordening with Giants and even brought about a sense of political intrigue with it. In older supplements, they were plenty of material to cover demons and devils, their origins and even their organization. From mind flayers, beholders, and even yuan-ti are covered and given fairly extensively insight for DMs on how to roleplay and handle them in anything as small as an encounter to overreaching arcs to even entire campaigns.
If you’ve had the pleasure to check out Volo’s Guide to Monsters from Wizards of the Coast, there is a plethora of insight and knowledge about some of D&D’s most iconic monsters, from how their work socially, their organization, and even their mentality towards each other and other races.
