Also known as the Fire Wall Shield, this round shield creates a flaming barrier in front of the holder. Anything that touches the fire barrier will be damaged. Lesser foes will be killed outright, but larger ones can withstand a moment or two of exposure before being killed. Compare the Lightning Shield, which envelopes the hero's body.
The Fire Shield doesn't decay with time, but with hits. Upon contact with a target, the Fire Shield will lose a small amount of durability, fading away when it hits 0.