So I have Lu Bu and Diaochan. Diaochan's special attack sucks. Lu Bu's special attack is mediocre at best. When the two get together, they unleash a devastating attack that completely changes the tenor of the match.
Except this fusion attack never happens when I'm up against a difficult opponent and I might actually NEED it. It only happens when my team could beat the opponent easily even without it.
I'm guessing that the fusion skill chance its lower than the normal skill. For balance purpose.I know your felling, I also have both of then.