Those Cobra operatives who serve as Toxo-Vipers, whether they chose to do so or not, are normal human beings - at least, in a strictly physical sense. They lack special powers of any variety, merely going about the business of doing evil with naught but their high tech equipment.
Limitations / Enhancements:
Hazmat Suit: the personal protective equipment of Toxo-Vipers is built to withstand most corrosives, doing so with rank value 50 ability. It is also somewhat airtight, at least where helmet's respirator is concerned, providing rank value 20 resistance to inhaled poisons.
The suit is bolstered with a chest-mounted unit which provides air conditioning (since the suit is hot), as well as sensors to warn Toxo-Vipers of chemical hazards (rank value 10 Atomic Sense). Furthermore, the helmet is shatter resistant, providing rank value 10 protection from head injury.
The problem is that, to maintain flexibility and reduce weight, the Toxo-Vipers' hazmat suits are not completely airtight. Thus, the longer they are exposed to dangerous chemicals, the greater the danger of exposure Toxo-Vipers face - which encourages them to work quickly!
Sidearm: should they face foes protected from their chemical weapons, Toxo-Vipers also carry a conventional sidearm. They may discharge a single round from this weapon to inflict rank value 6 Piercing damage, or a three-round burst to inflict rank value 10 Piercing damage.
Toxin Tanks: Toxo-Vipers carry a backpack filled with noxious chemicals, which they readily spray into their environs to spoil a battlefield, whether in advance of or during a fight. This poison is of rank value 20 intensity, inflicting like SD Metabolic damage to those who inhale it.
Additional Skill(s): their standard skills assume that most Toxo-Vipers were assigned to this position after their time as a standard Cobra trooper. However, those who had achieved higher ranks within Cobra naturally retain whatever skills they brought with them.
Chemistry: whether being chemical warfare enthusiasts or too unruly to serve the group any other way, Cobra's Toxo-Vipers are all educated extensively in chemistry. They may attempt Intellect ACT rolls related to chemical knowledge at a +1 RS.
Guns: all Cobra operatives have the ability to wield firearms in combat, and Toxo-Vipers are no exception to this rule. They may discharge rounds from any standard, semi-automatic, or fully automatic rifle or pistol as if their Coordination was +1 RS higher than is listed above.
Martial Arts style A or B: furthermore, Toxo-Vipers are well-versed in the art of self-defense. They either wield type a, allowing them to Pound or Concuss foes regardless of their comparative Brawn or Fortitude, or b, granting them a +1 RS to hit in unarmed combat.
Military: Cobra has a Byzantine, difficult to follow command structure, and it's quite possible that some of its Toxo-Vipers 'earned' this rank due to an inability to comprehend it. Those Toxo-Vipers desiring to move on will master this skill, however.
Members of the clandestine terrorist organization known as Cobra, Toxo-Vipers can in principle consider the group a reliable contact. However, since this role is often considered a disciplinary one, most Toxo-Vipers are ultimately considered expendable by their erstwhile allies.
The Toxo-Vipers' uniform is a hazmat suit! Primarily purple in hue, this personal protective equipment is accessorized with black boots, red gloves, a dark teal chest panel containing various devices, and a large brown environmental helmet with red, yellow, and dark teal accents.
The role of Toxo-Viper is one of the most undesirable within Cobra's ranks. The group can find few volunteers willing to engage in chemical warfare for the organization, due both its horrifying effects in general and the dangers inherent to working in the Leaky Suit Brigade.
Sure, a few operatives are fine with, if not eager to perform the job. However, most Cobras who wind up serving as a Toxo-Viper do so after committing a major transgression against the group, and are just useful enough that the organization doesn't want to dispose of them.
Thus, many Toxo-Vipers strive to shine in the role, to either resume their former position or to move on to a less dangerous position, such as a Hazard-Viper. Those Cobras get much more reliable protective equipment, after all, avoiding the threat of zombification.
And, strangely enough, the danger of that happening to a Toxo-Viper isn't marginal. There are more than a few chemically-induced Toxo-Zombies and Zombie-Vipers packed away somewhere by Cobra, ready to be unleashed upon an unsuspecting public - especially GI Joe!
The second Toxo-Viper uniform is their most iconic. Also purple in hue, their hazmat suit is accessorized with a sea green, device-laden chest piece, sea green boots, a sea green codpiece, neon pink gloves, and a sea green helmet with a mirrored, neon pink face shield.
Compound Z Cannon: the brainchild of Cobra's leading toxicologists, Compound Z can reduce almost anyone into a mindless, fearless killing machine. It works against the metabolism of the living with rank value 20 ability, and can be fired anywhere within a Toxo-Viper's current sector.
Submachine Gun: if their chemicals fail them, Toxo-Vipers can use this weapon to inflict rank value 6 Piercing damage when discharging a single round, rank value 10 Piercing damage when discharging a three-round burst, or rank value 20 Piercing damage when firing continously.
The third Toxo-Viper uniform is a variant on the second. Their Cobra blue hazmat suit is bolstered with a sea green, device-laden chest piece, black and sea green boots, a sea green, pouch-laden belt, red gloves, and a sea green helmet with a mirrored, red face shield.
Cobra directories featuring a version of Toxo-Vipers:
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