Flame Shield

The Flame Shield (フレイムバリア), also known as Fire Shield and Red Shield (赤バリア), is one of the shield type power-ups that appear in the Sonic the Hedgehog series. It can be obtained by breaking item boxes with a flame or red shield symbol on them, which will then surround the playable character with a sphere-shaped bubble of flames.

With a Flame Shield, the playable character can take damage once without losing Rings or a life, perform a fast Fireball Dash in the air, and not take damage from fire-based attacks and hazards, or from walking in lava pools. However, it vanishes automatically once the player enters water.

The Flame Shield was first introduced in Sonic the Hedgehog 3. While the Flame Shield has not become as recurring power-up like the Lightning Shield, it has made some noteworthy appearances through the series.

Sonic the Hedgehog 3 & Knuckles
The Flame Shield made it first appearance in Sonic the Hedgehog 3 and its add-on continuation Sonic & Knuckles along the Water Shield and Thunder Shield. In both games, Flame Shield can be obtained from white monitors with flame mark on them. The player can also get Flame Shields from Bonus Stages by collecting an orange gumballs with a B-letter on them.

Like other shield type power-ups, when a playable character is equipped with a Flame Shield, it will protect the player from one hit worth of damage from enemy attacks and/or contact, spikes, and other environmental hazards in the Zones by keeping the player from losing Rings or a life. After blocking a damaging blow however, the Water Shield will disappear, and the player is usually send flying slightly backwards. However, the Water Shield is not able to protect the player from falling into bottomless pits, being squeezed by Crushers, or the time limit of completing the stage running out, all of which give an instant death. Also, if the playable character make contact with water while equipped with the Flame Shield, the Flame Shield will automatically disappear.

While equipped with a Flame Shield, the playable character becomes invulnerable to any form of fire-related damage, such as fire-based attacks from enemies, flames from fire-spewing obstacles in the environment, and even prevents damage when walking over pools of lava.

When Sonic is using the Flame Shield, it exclusively allows the player to do a forward Fireball Dash by pressing, or  after jumping.

Besides blocking damage and granting invulnerability to fire the Flame Shield can also deflect regular energy projectile shots from badniks, such as Bloominators, Blastoids, Spikers, and Clamers.

Sonic 3D Blast
The Flame Shield (here called the Red Shield) made another appearance in Sonic 3D Blast along with gold and blue shields, where it can be obtained from monitors with red shield mark on them. In this game, the Red Shield possesses few of the abilities it had in Sonic the Hedgehog 3 and Sonic & Knuckles, but still retains its basic effects, such as protecting against one hit of regular damage and making the playable character immune to fire-based, thus allowing the player to move on the surface of lava pools.

Sonic Generations
The Flame Shield reappeared in the console/PC version of Sonic Generations, where it is both an equipable Skill that creates a Flame Shield once for each act, and an item box power-up for Classic Sonic. Flame Shield retains all the effects it originally had in Sonic the Hedgehog 3 and Sonic & Knuckles.

The item boxes with the Flame Shield appear exclusively in the Challenge Acts "Flame Shield Challenge" and "With Your Powers Combined" where the player has to use its abilities to clear the acts. The Skill for the Flame Shield can be then bought from the Skill Shop for 300 skill points after clearing the "Fire Shield Challenge" and cost 70 Skill points to be equipped. To activate the Skill in gameplay, the player has to press /.

Sonic Lost World
Flame Shield makes another appearance in both the Wii U and Nintendo 3DS version of Sonic Lost World. In Wii U version, the Flame Shield is a power-up that can be obtained from the Miiverse, where players can share power-ups and items with one another via Miiverse. In Nintendo 3DS version, it can be found in item boxes with a red shield mark on them.

It does not allow the Fire Dash, due to the Homing Attack being mapped to the same button that the Fire Dash was initially, however it does protect against lava fountains and fireballs that are not part of an Orbinaut.

Sonic the Hedgehog (animated series)
In the episode "Doomsday Project" of Sonic the Hedgehog animated series, two floating robots use fire shields to attack Sonic.

Archie Comics
The Fire Shield appears in Sonic Universe #38, where Hope Kintobor was working on the shield but she couldn't stabilize it. With this, she inserted it inside a shield where she would help E-123 Omega with the current fight Dr. Eggman is having at Central City at that current moment. When Snively had came in and wanted Hope to join him for world domination, Hope used the Fire Shield to force Snively to leave her lab immediately. When the battle was over, Omega came to comfort Hope, thus the Fire Shield went away after Omega went to hug her. (SU #38)

Trivia

 * The Flame Shield disappearing when making contact with water is similar to the Lightning Shield.