Not sure if you'll see this: Contagion with Chaotic Freeze is fantastic if you want to do any Cast On Freeze stuff (I use Cold Snap), and put Impending Doom on my Despair. This results in every kill leading to mass eruptions of Novas, and mass spread for my Effigies to do work.
Basically, curse a group with Despair + Decaying Hex to spread the curse with Contagion. Impending Doom causes Novas which are also hits alongside the Effigies, which freezes, which causes cold snap, helping the chain reaction.
Not sure if you'll see this: Contagion with Chaotic Freeze is fantastic if you want to do any Cast On Freeze stuff (I use Cold Snap), and put Impending Doom on my Despair. This results in every kill leading to mass eruptions of Novas, and mass spread for my Effigies to do work.
Basically, curse a group with Despair + Decaying Hex to spread the curse with Contagion. Impending Doom causes Novas which are also hits alongside the Effigies, which freezes, which causes cold snap, helping the chain reaction.