The Codex of Blood

The quest is completed by clicking on the book, The Codex of Blood behind the boss, Grandmaster Vorpil after he is dead. It is easy to miss and forget to do this while running Shadow Labyrinth because there is no yellow question mark (at least when I ran it last, Blizzard may have changed that by now) so take a look at the screenshot to familiarize yourself with what the scene will look like.

The book reads;

The musty pages of the codex seem to magically turn themselves, guiding your attention to a specific chapter past horrors no mortal eyes should ever perceive.

The book opens to a page that somehow feels "right" yet so very wrong.

• Read on, if you dare...

Long ago, in a dimension of the cosmos unfathomable to mortal minds, there was born - if such a term can be used for it - a being of such unbelievable power that it's very entrance into existence shattered all reality around it.

Known only as Murmur, it was the essence of sound, and to hear it speak was to hear death eternal!

• Read on, if you dare...

Existing only for chaos, it's slightest whisper meant the destruction of whole worlds!

Yet still, there were those that would try to worship this mindless being. There were even those more insane who dared to think to control it!

• Read on, if you dare...

And lo, how the mighty fell trembling at it's feet, fearful that it might direct it's words upon them.

But still these charlatans, these worshiping pretenders to a non-existent religion, rail against the inevitable in a vain attempt to control their "god." Uncaring, and likely not even noticing them, Murmur yawned and they knew oblivion.

Yet one somehow managed to survive, and in his insanity found a way to bring Murmur into the world.

• Read on, if you dare...

A mortal possessed of arcane and dark knowledge that none could surpass, he devised a method to enhance his summoning through the capture and use of souls untold.

Whole civilizations were brought to extinction through his soul devices to fuel the ritual through which he and his conspirators would bring Murmur into their world.

• Read on, if you dare...

And summon forth Murmur they did.

Powerful magics of containment and silencing were employed, held together by the constant supply of souls being fed into them. Yet still they could not control the beast, could not bend it to their will.

These mortals began to devise different strategies, and one after the other they all failed. And in so doing, they weakened the rituals, accidentally giving Murmur the slightest modicum of freedom.

It was all that was needed.

• Read on, if you dare...

Only this book survived the cataclysm that destroyed their world. Those proud and foolish men who thought to control a cosmic being of untold power.

Would you, the possessor of the codex, do the same?

Have you devised a foolproof method to summon forth Murmur, or any of the other entities cautiously whispered of in these unhallowed pages?

We shall see.

Currently it tells me to complete quest (lit up in yellow) for the codex of blood quest....but it will not give me the reward when i click on complete quest, no matter if i do it before or after killing the boss. What am i missing to do? And yes, i did read thru the book pages.

currently it tells me Complete quest but even after a reload won't accept the click
it did this before or after i killed the boss, same way