Talk:Ignis/@comment-80.222.53.17-20130702161521/@comment-68.3.202.96-20130705080822

Armor piercing damage is highly effective against everything except light infested (which usually die fast anyway, especially if you have fire mods).

http://warframe.wikia.com/wiki/Enemy_Vulnerabilities

As you can see, medium grineer take 150% armor piercing damage to the body, and 300% to the head. They do not get more resist to this damage type at a higher level either. With a Latron against a medium grineer around level 30, you'll probably do around 6-7 base damage. However, if you add a 60% armor piercing mod, you'll do that 6-7 base damage, along with 36 armor piercing damage, due to medium grineer taking 150% from armor piecing. This is essentially a 90% damage boost, calculated off the base 40 damage from the weapon.