For this trophy, you need to beat
, at the end of Chapter 4. My best recommendation is to start with RAV/RAV/RAV and attack his main body aggressively. Once you manage to stagger him, switch to RAV/COM/RAV with Serah
and a decent magic using monster as the Ravager. This ensures that everyone continues to attack the main body. Your goal is to deplete at least half his HP in each stagger. It will most likely take you two staggers to bring him down. Feel free to switch to MED/MED/COM to heal if neccessary.
Acting aggressively, you should be able to take him down in two staggers. After that you'll need to perfect another cinematic action sequence. The button prompts are as follows,
,
,
+
,
(repeatedly)+
, then finally
(repeatedly).
Afterwards, you should get 5 stars and your trophy.