There are seven different colors of ISO-8 in the Facebook game Marvel: Avengers Alliance. Each different color of ISO-8 comes in multiple specific types. Each type grants a hero a bonus to a specific set of stats. Red ISOs are entirely offensive in nature. None of the red ones grant bonuses to any of the defensive stats, nor to health or stamina. These are rarely general purpose ISOs, but rather the type that you slot onto a hero that is specifically designed for alpha striking. Offense tends to be more efficient than defense in this game, so it is not uncommon to slot these on at least some of your heroes. The following guide to red ISO-8 in Marvel: Avengers Alliance will give you all the information you need to properly equip your heroes with these ISOs.
Reactive Strong ISO-8 (Attack / 15,000 Silver, 3 SP) – Strong ISOs have a number of major advantages. First, they are cheap both in terms of silver and Shield Points. Second, they improve only the attack attribute of the character. ISOs that grant a bonus to two stats only grant 80% of the bonus and ISOs that boost three stats only grant 60% of the bonus. If you want to absolutely max out attack, you can’t do better. This is particularly good if you want to create an alpha strike hero, like Iron Patriot. It also is one of the best choices to flesh out a hero after you have used other slots to shore up weaknesses or support strengths. Attack is pretty much the most generally useful stat in the game. It is particularly useful to store a few spare uniforms for your agent that are slotted with nothing but Strong ISOs. This is harder to do with heroes, but if you can afford the silver and Shield Points, you may occasionally re-slot a hero with nothing but Strong for a particular battle and then restore the hero to a normal slotting afterwards.
Reactive Precise ISO-8 (Accuracy / 13,000 Silver, 3 SP) – Precise is cheaper than Strong, because it isn’t quite as useful. It grants the same numerical bonuses, but to accuracy rather than attack. Due to the prevalence of avoidance effects in the game, accuracy simply doesn’t offer the same level of benefit as attack. The primary use of this ISO would seem to be increasing the accuracy of a hero with low accuracy, but in actuality, it is often best used to increase the chance of a critical hit for a hero with a high accuracy. Low accuracy is best shored up by including an ally that can apply the targeted buff or a similar ability that assures attacks will hit.
Reactive Violent ISO-8 (Attack, Accuracy / 20,750 Silver, 4 SP) – If you really want to shore up bad accuracy on a hero, the Violent ISO is your best choice. It costs half again as much as Precise, and only grants 80% of the bonus, but it also grants an equal bonus to attack. This combination significantly increases the offensive ability of just about any hero and the addition of attack makes spending slots on accuracy much more efficient. A hero with four or five slots of Violent ISO-8 almost always deals above average damage.