Small prow just right of the slab of Lucifer, on the boulder to the right of blue n°11, to the left of the one with La Boucle d'Oreille. Sitstart with a pocket left hand and a good hold right hand, climb the right arete and exit on the other face (5c) or by a mantle at the top (6a).
NB : only 5b, resp. 5c, without the sitstart.