SPOILER Rymek's Relic (screenshot !)

I don't know the exact order but I can give you the way to find it, in the exterior of the house, go to the stair you come from, there is a button near it that will play a certain order of sound (4 or 5, don't remember) you need to press them in the order by using the indications of the item frame of each button

 

Oh, thank you! That actually resolves everything!