Lion's Roar is Cor's Technique the player can invoke while he is a guest party in Chapters 2 and 14 (the latter only in Windows and Royal Editions). In Chapter 2 he joins the party twice: once on the stretch from the Prairie Outpost to the Keycatrich Trench, and another time in Norduscaen Blockade. In Chapter 14, he joins for the imperial stronghold invasions and for the second half of the Cerberus boss battle if the player did all sidequests in Insomnia.
Lion's Roar has him perform a powerful upward drawn slash that cuts a vertical wide shockwave that moves in a line. It costs 1 tech bar.
The Japanese term "Shishifunjin" is an idiom for a type of furiousness that is full of vigor and/or intensively forceful.