Forum:Little Boys Squad

I tend to use 4* units (Leon, Verica, Zaza, Grfl, Nyx and sometimes Maria) to hunt for nymphs, spirits and idols, and I always seem to get lucky with them than using my main squad. What's the real score? I was told that you have to overkill to cap a unit. Was the damage output of my main squad too much? Or is it just random breaks of the game?

Thanks! Any comment is welcome.