Does anybody know were the last shard of at heroin is

Did it srsly change it to at heroin I meant aetherium

Look in the book. Go where it points to.

Where have you been to get the other three? That will help with any explanation of where the last one is.

And maybe use the "Search" function in the future as there are already threads about this very topic.

Thanks I didnt think to read the book

How do you do that puzzle (I guess it's a puzzle) right after killing the dwarven centurion?