I've created a number of Atlantean custom classes for my Hyperborean ACKS campaign. I don't have any demi-humans in my game, so Atlanteans play a similar role as dwarves in vanilla ACKS.
Here's how I built their racial values: Atlantean Custom Classes
And here's three sample classes: Atlanteans in Hyperborea
- Atlantean Dungeoneer: Many Atlantean half-breeds show a predilication for mechanical devices; Dungeoneers are skilled in all manner of traps and locks.
- Atlantean Artificer: The ancient Atlanteans were a scientifically advanced race, creating artefacts of amazing power; Artificers are the heirs of this lost knowledge.
- Atlantean Alchemist: Alchemists follow ancient Atlantean traditions, seeking enlightenment and mastery of physical and chemical processes.
Dungeoneers are a variant of my Delver class (itself adapted from the Dwarven Delver). Artificers are reskinned Dwarven Machinists (from the ACKS Player’s Companion). Alchemists are a variant on the Specialist Mage (but due to their specialized nature may be better suited as NPCs).