what were hill titans? as that would explain the against mad cast system.I can't answer for their homebrew, but I can give you the standard D&D lore.
Primordials as a "type" came about in 4e (there term was used loosely before to refer to various entities). In 4e the primordials were elemental entities of massive size and incredible power. They created the prime, shadow fell, and fey wild planes (the shadow fell and fey wild were bits cast off when they made the prime). The also created the titans, which in turned created the giants (which are lesser versions of the titans, so you have a type of titan for each type of giant), which in turn created dwarves. Primordials ruled the elemental chaos and after the gods started messing with the prime, went to war with the gods. The primordials were generally more powerful (it took Moradin, Pelor, and Bahamut together to imprison Mual-Tar the Thunder Serpent), but less organized than the gods. The gods and their servants eventually defeated the primordials and their servants. There is a lot more lore, and nuance, than that, but it is a general overview.
In 5e, Primordials are still a thing, but it is not clear if they hold the same significance they did in 4e. I think it is intentionally vague.
I read it and found it lacking.I couldn't see it mentioned here already but Volos guide to monsters has a chapter on Giants.
I read it and found it lacking.
I have considered having the base giant stat refer to the equivalent of those 4hp commoners thus making giants with class levels utterly scary.Yeah, I figured that might have been the case but thought I’d mention it on the off chance you’d missed it.
I had an idea for a low level adventure where the characters have to sneak through a hall of sleeping frost giants (It seems like a fun way to use all the frost giant miniatures I have) and reading the Volos entry wasn’t overly useful.
In my setting, during ancient times Giants once fought against an army of invading Demons and saved the Island Nation after it had been dragged into the Abyss.
They where earth titans:what were hill titans? as that would explain the against mad cast system.
In 4E they were pretty much the Elemental Beings that resided on the planet BEFORE the various gods came from the Astral Sea. Once the gods touched down on the world and started creating their own races, the Primordials took that personally and both gods and Primordials engaged in a bitter war against each other called The Dawn War. The gods won in the end, but nobody was pretty much happy after it was all said and done. One of the greatest Primordial champions even slew the OG Dragon god, which then shortly after lead to the creation of Bahamut and Tiamat.what are primordials?
There aren't actually many live ones.Frost giants and several frost giant-centric locations figure pretty prominently in Icewind Dale: Rime of the Frostmaiden.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.