Great thread. Wish I'd found it before I spent a day combing through the core books for tidbits to add to my own setting. Some additions:
- Dwarves were created by Moradin. In addition to the azers, galeb duhr are also former dwarves still in the service of giants.
- Moradin gave the first dwarves five tools. One of them is the Axe of the Dwarvish Lords.
- Halflings were created by Melora and Sehanine, who eventually lost interest in the halflings (according to legend, anyway). Avandra adopted them.
- It's probably a safe bet that Bahamut created the Dragonborn, but I don't know if this is spelled out anywhere.
- Lolth was the goddess of fate, before her corruption.
- Vecna is not one of the original gods, he ascended to godhood (his hand and eye date from before that time). Some of his history could be imported to taste (vast necromantic empire, betrayal by Kas, etc.).
- I think the Tomb of Horrors gets a mention somewhere in the DMG, so Acererak could also be imported.
- Gruumsh's forces are eternally besieging Bane's Iron Fortress of Chernoggar in the Astral Sea.
- Avandra, Melora, Torog, and Vecna have no known home in the Astral Sea.
- One of the heroes of ancient times was Arnd, a poor cleric of Kord known for his fighting spirit and holy strength.
- The yuan-ti ruled "ancient, sprawling empires" in prehistoric times. Their kings ultimately went mad.
- Stars (from Warlock spells): Acamar (dark and distant), Delban, Khirad (dire portent), Thubad (above frozen emerald seas)
- Hellish names (from Warlock spells): Agathys, Avernus, Dis, Malbolge, Phlegethos
- Wizard names (from Wizard spells): Bigby, Mordenkainen, Otiluke, Evard
- Dwarves were created by Moradin. In addition to the azers, galeb duhr are also former dwarves still in the service of giants.
- Moradin gave the first dwarves five tools. One of them is the Axe of the Dwarvish Lords.
- Halflings were created by Melora and Sehanine, who eventually lost interest in the halflings (according to legend, anyway). Avandra adopted them.
- It's probably a safe bet that Bahamut created the Dragonborn, but I don't know if this is spelled out anywhere.
- Lolth was the goddess of fate, before her corruption.
- Vecna is not one of the original gods, he ascended to godhood (his hand and eye date from before that time). Some of his history could be imported to taste (vast necromantic empire, betrayal by Kas, etc.).
- I think the Tomb of Horrors gets a mention somewhere in the DMG, so Acererak could also be imported.
- Gruumsh's forces are eternally besieging Bane's Iron Fortress of Chernoggar in the Astral Sea.
- Avandra, Melora, Torog, and Vecna have no known home in the Astral Sea.
- One of the heroes of ancient times was Arnd, a poor cleric of Kord known for his fighting spirit and holy strength.
- The yuan-ti ruled "ancient, sprawling empires" in prehistoric times. Their kings ultimately went mad.
- Stars (from Warlock spells): Acamar (dark and distant), Delban, Khirad (dire portent), Thubad (above frozen emerald seas)
- Hellish names (from Warlock spells): Agathys, Avernus, Dis, Malbolge, Phlegethos
- Wizard names (from Wizard spells): Bigby, Mordenkainen, Otiluke, Evard