Diamond Throne

The Diamond Throne is Monte Cook's and (mostly) Mike Mearls' setting for Arcana Unearthed.

This started in its own book separate from the AU book, but was inlined in Arcana Evolved.

Backstory

The lands of the Diamond Throne, retconned

Above all DT makes clear that on this world Serran did once used to be such a thing as eeevil.

Lord Foul was played by the dramojh, something like "our scions" in Draconic. Some asshole dragons got into their scaly horny heads to juggle some demon-testes or something. Thereby were spawned these nightmarish mixes of dragon and spider (because creepy) who subsequently took over THE WORLD, at least the northeast side of their continent.

After centuries of tyranny and body-horror throughout this book's map, the Giants got loose from Donaldson's book and anchored off the coast. The liberated humans sided with them; the lore is less clear on the Litorians, who might have rebelled by themselves first, but they too rallied to the giant-human alliance. Subsequently ensued a war to the knife, eradicating the dramojh, much to everyone's surprise. The humans soon found themselves under new management - Giant management. Suckers!

Prestige Classes

DT suggests Arcane Archer, Assassin, Dwarven Defender (for giants!), loremaster, shadowdancer. From Eldritch Might 1-2 (but not 3...): Embermage, Mirror Master, Eldritch Warrior. The Scarred Lands' Relics & Rituals series get a shout-out in the Vigilant and the Spirit Walker.

Specific to DT are: Beast Reaver, Crystal Warrior, Darkbond, Giant Paragon, Mage Priest (to replace the cleric), Ollamh Lorekeeper, Rune Lord (who replaces the EM1 Graven One), Somnamancer.

The Giant Paragon will be extended to several other races in AE, in the form of racial levels.

Monster, Monster, Mo-mo-mo-monster

• Alabast are alien Noldor from elsewhere (but they're Not Elves because shut up).
• Chorrim are militaristic hostile humanoids from the caves but aren't orcs or hobgoblins because get bent.
• Cyclops, you get it. Of interest to the giants because they look like they might be evidence that the giants are not, as everyone says they are, aliens here.
• Dark Warden aren't Forestals from The Illearth War. In this context they are an undigested prestige-class of NPC druids so redundant.
• Harrid aren't nagpa but quit bugging me. They live over on Skaraven and subsist on magic.
• Inchon aren't bullywugs.
• Radont aren't the sentient horses from Lord Foul's Bane.
• Shadow Troll well you know.
• Rhodin are scavenging thieving humanoid scum but aren't goblins because fuck you. There's something like 'em in Ptolus. (Ed. = The whole AU / DT universe never was as original as it wanted to be.)
• Slassan are about as close to dramojh as you're likely to meet. Half snake, half spider, all nasty.
• Xaaer aka death ooze are Dark-infused big slimes.