After the horrible fate of Helios, pick up his shield as this can be used after you finished the game. (See Godly Possession Items). With the power of Helios’ Head, you can reveal hidden passages and uncover secret items shrouded in dust. Before proceeding, don’t forget to open the chest to your left and reveal a secret treasure by using Helios’ Head to your bottom right for another of Minotaur’s Horn.
Use Helios’ Head by pressing L2 and holding Triangle. Illuminate the wall north of you and it will reveal a secret passage.
The next area is very dark. Use Helios’ Head to temporarily lighten up the place. Sentries will be all over. With Helios’ Head you can stun them.