Locked Door in the Wine Cellar in the Manse of the Hallowed Brothers

[HellFire]

hey im running around the Manse for 2 h now but im not able to find a way into the room behind the locked iron doors in the wine cellar.
Does anyone know how to get into it?

[Arth]

The entrance is in the garden where there is that enemy that is exclusive to umbral mode, his appearence resembles a wardrobe (that enemy that open his face), the entrace is blocked by some wooden bench/planks.

[Livy]

Yeah, balcony garden at the upper manse where a marksman, pureblade, minic and head-umbreal hangs out. Has a grate that can be passed in umbral which is covered by destructibles.