User blog comment:Mich, Michele & Kuhla/Future Units Preview/@comment-26336535-20160227231416

Here's something I found a while back on Reddit. I'll condense it a bit, and put the sources at the bottom:

When Dream Evo units spark 150% of their damage distribution, they cause Cross Sparks to happen. Here's what I understand: You have the total damage of the Dream Evos in your squad, and you 50% of their damage per turn must be sparked to cause a Cross Spark to happen on that turn (basically, half the damage of all the Dream Evos in your squad has to spark for this to happen). Cross Sparks give stat buffs to units of the same element. The more units you have in the squad of an element (excluding the Dream evo that cause the Cross Spark), the higher the buff (e.g. Having a mono thunder squad with Dream Evo Eze, all thunder units get a 50% stat buff.) This is called Resonance.

Resonance also gives buffs to the whole squad:    The whole squad also gains elemental mitigation from the element that is weak against the Dream evo that Cross Sparked. You also get OD fill rate for the squad, based off of how many units match the Dream Evos element. 1% mitigation and 5% OD fill rate per unit that matches the Dream evos element, excluding the Dream Evo (so 5% max mitigation and 25% max OD fill rate.

So, basically, if you have a full mono squad with a Dream Evo, you get 50% ATK/DEF/REC buff, 5% mitigation against the element your squad deals strong damage against, and 25% OD fill rate.

Mono is back guys.

https://www.reddit.com/r/bravefrontier/comments/463zij/dream_evolutions_new_mechanics_information/

https://www.reddit.com/r/bravefrontier/comments/46euj1/update_on_resonance_effects_dream_evolutions/