Hello, this is my first damage cap limit weapon, HIGHLY effective when built right. You can substitute the riven with anything that gives damage or attack speed up to you, but this build is an eclipse build(subsume [Mirage] for eclipse). required minimum of 300% eclipse bonus(200% power stength). Don't focus on the % values of the mods, overframe rates it as melee effective(without using arcane contagion). even without eclipse you'll be dealing about 200-500k dps, eclipse is multiplicative damage meaning everything will be multiplied by 300% value. using eclipse will allow you to deal millions and in my case (300% power strength w growing power) will allow 500% multiplicative damage bringing your total up to around 1-6 billion damage. I know sounds unrealistic but wait till you try it out! Enjoy, this will probably be the best and easiest guide for you to use arcane contagion. [Chroma] or [Chroma Prime] can also use for this damage buff, but [Chroma] is more of a solo warframe id use him for solo things, eclipse if your using other warframes such as [Volt] or something, other than that enjoy!