I'm not too happy with it, so some things may change, but whatever...

Name: Fire Fiend/Fire Devil/Fire Demon

Description: The Fire Fiend is a muscular, humanoid being cloaked in scarlet flames. The virus resembles a hairless man, heavily muscled and bare-chested, with dark red skin. He stands slightly taller than your average Navi and is stocky and wide at the shoulders. His fingers are tipped with short, sharpened nails colored black and dark horns curl up from his forehead. The lower half of the virus is never seen as it is covered in flames that reach up to its abdomen. The Fire Devil has dark blue skin with cobalt flames while the Fire Demon has jet black skin with ebony fire.

HP: 90/120/150

Attack: 30/60/90 (Knockback property)

Special: Heatwave ~ The Fire Fiends mere presence on the battlefield causes the area to heat up to an extreme amount. This causes everyone, allies and opponents other than other Fire Fiends, to take 20 DMG per turn. Passive, lasts until Fire Fiend is destroyed. ((Special Note: This ability stacks with the presence of multiple Fire Fiends. However, it stacks slowly in five DMG increments. Ex: 1 Fiend — 20 DMG, 2 Fiends — 25 DMG, 3 — 30 DMG, ect))

Cursed Step ~ The Fire Fiend is a dark being with the ability to curse the ground it walks upon. This ability creates a small portion of Curse terrain every round until the Fire Fiend is deleted.

Shroud of Flame ~ The Fire Fiend can use its abilities to cloak itself in a pillar of fire. This inferno is so intense that any non-aqua BattleChip used against it will instantly evaporate and create a cloud of smoke that reduces the accuracy of all attacks directed at Fiend to D-Rank for 1 turn. Lasts until hit or destroyed by Aqua attack.

Strategy: The Fire Fiend is a very aggressive virus, spending most of its time attacking. If reduced to half its total HP, it'll attempt to use Shroud of Flame to protect itself. They usually travel in small groups of 2-3 to make full use of their Heatwave and Cursed Step abilities.

Rewards: Zenny, Shroud of Flame BattleChip

BattleChip: Shroud of Flame
Protection: Negates one non-aqua attack, creating smoke screen that reduces all attacks against user to D-Rank for 1 turn. Destroyed by Aqua attacks.
Accuracy: S
Description: Wraps the user in flames that shield them from non-aqua attacks and reduces accuracy. Destroyed by Aqua
Duration: Until destroyed or hit
Element: Fire