Glory to Ka!
we really need a big type of aberration line just for boss battles,
would fire be solar titans?
what would stone and hill even be?
what would storm titans be other than truly terrifying?
Storm giants are the ones who become Sun Titans. They’re basically beefed-up D&D Storm Giant Quintessents with evocation magic and the ability to erupt into blinding light.
Fire giants mature into Brass Titans. If you injure them, their blood splashes onto you and burns you. They have innate transmutation magic and a metal-based telekinetic effect: it’s a recharging Strength save restraining feature they use right before they attack you. The titans gain an aura that deals thunder damage.
There are no stone giants in my games.
Hill giants mature into War Titans. They start out as ettins basically (2 heads, 2 arms), then have four heads and four arms as an adult, six heads and arms as an ancient, before topping out with ten heads and arms as a titan. Hill giants are nothing fancy: aside from the mere sight of them dealing psychic damage to any creature with a certain distance, they exist mostly to beat you to a bloody pulp.