Morndinsamman is an obscure bit of gamer slang that you will occasionally hear amongst the Dungeons & Dragons fandom. It is the in-universe "pantheon name" for the pantheon of Dwarf Gods, as featured in Greyhawk, Forgotten Realms and Planescape, making it analoguous to the Seldarine, the pantheon of Elf Gods. The term is less popular, and actually didn't come into the game until 2rd edition, in the "Demihuman Deities" sourcebook for the Forgotten Realms, although the idea of a Dwarvish pantheon goes all the way back to Advanced Dungeons & Dragons 1st edition.
The exact membership of the Morndinsamman (which is apparently dwarven for "shield brothers on high" or "high dwarves") has fluctuated over the editions:
Moradin first appeared on his own in the original Deities and Demigods Cyclopedia for AD&D 1e. The first version of the Morndinsamman appeared in Dragon Magazine #58, where "The Gods of the Dwarves" introduced us to Abbathor, Berronar Truesilver, Clangeddin Silverbeard, Dumathoin and Vergadain; this pantheon was subsequently reprinted in the original Unearthed Arcana.
AD&D 2e saw the Morndinsamman reappear in the Forgotten Realms splat "Dwarves Deep", which expanded upon the original version with Sharindlar, Marthammor Duin, Gorm Gulthyn, Haela Brightaxe and Thard Harr. An alternate version would be presented in "Monster Mythology", changing up the membership and adding new members Dugmaren Brightmantle and Muamman Duathal (also, technically, Gnarldan Steelshield, but he was an example mythical hero and not a god, so he doesn't count). The Planescape sourcebook "On Hallowed Ground" would bring together several gods from the past two versions of that edition, as well as adding the "Dark Dwarf Gods" of Laduguer, Diinkarazan and Diirinka. A final version of the pantheon would appear in "Demihuman Deities", which added newcomer Deep Duerra.
3rd edition would update the "Demihuman Deities" version of the the pantheon in "Faiths and Pantheons". Races of Stone would also add several new deities; Hanseath, Mya, Roknar, Tharmekhul, Thautam and Valkauna.
5th edition would see the entire Morndinsamman from all of its various sources return and be coalesced into a singular pantheon with the release of "Mordenkainen's Tome of Foes". Well, with the exceptions of the Derro Gods, who are merely mentioned in passing in the bestiary section of that book.
The Morndinsamman can be divided into three sub-pantheons; the Dwarf Gods, the Duergar Gods, and the Derro Gods. The existence of the Derro sub-pantheon is only mentioned in "On Hallowed Ground" and has been ignored ever since.
- Berronar Truesilver
- Clangeddin Silverbeard
- Dugmaren Brightmantle
- Muamman Duathal