Flame of the Firehawk

The  is a shield that you get as a reward from Lilith at the end of the Cult Following; The Enkindling.

Special Weapon Effects
Constant fire nova effect while shields are at 0. This effect lasts indefinitely, as long as your shield remains at 0, triggers roughly every two seconds.

Trivia

 * The flavor text refers to the mythological bird the phoenix, which was said to die in a burst of flames and to emerge from these flames reborn, effectively being immortal.