Battle Chasers: Nightwar

Story related, can not be missed.

When you enter Path of Fangs, you will meet a lycelot that says he will open the gate for you to proceed through if you kill two banner carrier lycelots first. There is one on each of the paths to left and right through the gates he opens. Take them out and then return to him and he will open the gate. Make your way through and you will encounter the Lycelot Chieftain who has just killed the lycelot who helped you. The boss is just a more powerful version of the regular ones you encountered, but likes to use curse a lot, so it's best to use Calibretto's Purify Burst if he hits your whole party with it to cure and heal them. Once you finish him off, the Path of Fangs will be completed and the trophy will pop.