You want to go Eidolon hunting? Then this build is for you and your [Chroma] or [Chroma Prime].
FAQ
Why no [Serration]?
[Chroma]'s Vex Armor, which you definitely should be using, doesn't scale with [Serration].
Why Radiation and Cold damage?
Eidolons are weak against radiation damage. Even though their armour against cold ist better, the damage increase of Primed Cryo Rounds is stronger than that of a 60/60 status mod.
Why Hammershot?
According to the dps calculator I used, the crit damage gives us more dps than anything viable for more base damage, like a 60/60 status mod. Feel free to correct me.
I have a Riven, what should I do?
Replace Hammershot with the Riven. You most certainly also have to forma it again.
What Riven stats should I look for?
multishot, crit chance, crit damage, any negative we don't care for
I don't want to forma a D-polarity (Vazarin) for Primed Cryo Rounds, because I don't use it in other configs
Forma instead another Dash- and V-Polarity for Vigiliante Armaments and [Vital Sense].