The Stranger sighs with relief upon your approach. "It appears, as usual, that when it comes to the secrets of Clovis, there are always more hidden away.
"The old man was… is, rather, nothing if not insanely overprotective. As such, we cannot access it without a potency of Darkness energy.
"Fortunately for us, there's been a surge of just such an energy within the twisted caverns of the Vex here on Europa.
"Take the Skeleton Key and investigate the surge. If I'm right, it should give us what we need to unlock a further understanding of Stasis."