With 75 energy of Dark Smoke, 5 Eclipse duration, I took 1 (normal) Eclipse and got:
You swallow the Eclipse. It pulsates its way down your throat. Ugh.
After a moment, though, you see things differently.
The pain in your chest subsides a little.
You learned a new Technique: Smoke TalonsYou've gained 20 energy of Ocean Sight.
You learned a new Technique: Watch Winding
(I now have 65 energy of Dark Smoke and a whole lot of Broken Bone, which is probably from something else that I didn't notice before)