Interact with the lever and wait until you’re transported to the surface.
There, pull another level that previously blocked access to the elevator from the outside.
bring up the world map and head back toSeptimus Signus’s Outpost.
Read it from the inventory to learn that the mage wants you to meet with him again.
you better harvest samples of Orc, Falmer, Dark Elf, Wood Elf and High Elf blood.
I’d therefore suggest searching for those who will be aggressive towards you from the beginning.
It will tell you that you’re in fact speaking to Hermaeus Mora.
It turns out that Septimus will soon become useless to him and he’s looking for a new emissary.
Having killed the Orc, interact with its body and harvest the blood.
Falmerscan be mostly met while exploring ruins, dungeons, graves and other such areas.
Afterwards look for a recently killed Falmer or kill one of the new creatures (screen above).
don’t forget to examine its body to harvest the blood.
Dark Elves(screen above) can be met in some camps, caves and keeps inhabited by mages.
Members of this race are usually necromancers.
OF course don’t forget to examine the body of the defeated Dark Elf to collect its blood.
Wood Elves(screen above) can be met in most camps and caves inhabited by hunters.
Deal with the bear and look for a dead hunter, who should be a Wooden Elf.
High Elves(screen above) can be met in some camps, caves and keeps inhabited by mages.
Be careful, as they are usually demanding enemies capable of casting powerful spells.
Of course don’t forget to examine the body of the High Elf to gather his blood.
kick off the world map and use fast travel toSeptimus Signus' Outpost.
Head inside and speak with themageto give him the filled Essence Extractor (screen above).
Wait for Septimus to unlock a passage to a new location (screen above).
New main objective: Take the Oghma Infinium
Approach theOghma Inifniumand interact with it.
You will be able to choose a prize for finding the book.
Notice:If for some reason the prize-choice window doesn’t show up, it might mean a bug.
Turn around and attempt to leave the room to come across theWretched Abyss(screen above) yet again.

Whether you agree to be Hermaeus' champion or refuse to accept his offer doesn’t matter.
The quest will end in both cases.
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