Chain of Friendship

Chain of Friendship is the fifth skill in 's Humanity skill branch. It gives an extra 15% chance for a to continue after each of Shulk's turns.

Overview
Any way to increase the length of a chain attack is immensely useful, which is probably why it's quite expensive to link. As Shulk gets it "for free", having him in the first slot gives the most opportunities for it to trigger.