Larian Studios Forums Divinity - Original Sin Divinity Original Sin - Help/Tips/Tricks How can I open the door in the source temple?

I'm blocked in front of a door with a human face in the source temple. I don't know what to do?

I don't know if its important but, I would like to precise:
In the end of time, I've opened only three of the four doors.
I only have 6 blood stone or depleted stone.

What to do? I have tried to hit the dor, but I don't hurt it.