The Fire giants live around the volcano near the center of Raxus, though some have been known to wander around the nearby small desert. They are being introduced to Emria for militaristic reasons by the Veptims.
The physiology of Fire Giants are completely different for each one. One might be a one-eyed humanoid that is five meters tall, while another might be a giant 150 meter tall monster, who's very breath can bat a person around like a fly.
Fire Giants are automatically aggressive to anything twitching or acting suspicious, as supposed to the other types of giant, Frost and Stone, who don't attack on sight. Their eyes glow darker red than normal when attacking or being attacked.