Edit: This is not the max amount of chain attacks, and is outdated! Didn't realize the Lyn from Veronica can clone herself. x35 is the max and has been done elsewhere.
I did a run through where every single character was a Hero with dual assist and got the magical x32 hit Lucina All For One.
As far as I’m aware this is the max thanks to 1 all for one user + 13 deployment slots x2 + 4 Lyn clones + 1 Veronica Summoned Hero x2
![](https://i.ytimg.com/vi/BoKPpqHedwI/maxresdefault.jpg)