To find the five Talking Gargoyles for Dean, look in the following areas.

In the courtyard where Dean is standing.
In the Paved Courtyard.. You must repair the broken staircase in the corner. It is at the end of the balcony in the corner.
In the Viaduct.
The fourth floor outside in the balcony.
The spiral staircase when you walk up to DADA.

Note: You can use Incendio on Talking Gargoyles for Discovery Points.