Capítulo 613: A Bygone Shadow

Flame Calamity didn't waste time as his eyes turned ablaze, "Still not going to take your combat form. Let's see how long you can continue to hold back, Hell Fire Domain!" 

Jacob suddenly felt an alarm ringing in his mind as he quickly retreated when the temperature around Flame Calamity began to rise like crazy.

In a hundred-meter radius, dark crimson flames began to blaze, reaching thirty meters height like an inferno. Flame Calamity's body completely vanished within as he seemed to have become one of the flames. 

This was the most powerful innate ability of the Fire Wyvern, the Fire Domain. Flame Calamity was almost invisible in this domain as it became one with fire, and no physical attacks could hurt him.