I'm in the cave of hiberheim in front of a rock barrier, guided by an elemental spirit (Almina, apprentice of Icara apparently).
Near that rock barrier it is a lever which I cannot move unless I have a "mini golden key" (approximative translation of the french "minuscule clé dorée").

But when i have the key on me, and use the lever, the rock barrier doesn't disappear.
So I'm stuck in that quest.