[Agema]

Barathron (Latinised to Barathrum) = an abyss or pit, in ancient Greek.
Rhuax = a stream of lava, also ancient Greek.

Double regen rate or +3 protection? Plusses and minuses either way. Neither is something you want to meet down a quiet alley on a dark night.

No boot slot for elemental royalty.

For your Misc. slot, I recommend an amulet of magic resistance (astral). You can never have too much magic resistance, stuff that is most dangerous to your big SCs generally requires MR rolls.

As Earth elemental royalty have high natural protection and regeneration, can cast buffs like invulnerability, and you've already got Krupp's bracers, you might want to think about different armour that gives resistances. All the protection in the world won't save you from being hit by, say, enough armour-negating lightning attacks. For that matter, you might think about something other than Krupp's bracers as well.