Really short, and let me offer some criticism:
First off, this part of Chapter 1 I have taken to examine and rewrite.
"Alexander had a taste of power from being in control of his workers and their loved ones. He grew older, and couldn't afford to die at any age. He found through studies that a substance called Vitae could extend his life. He obtained the substance by torturing his workers. He used his servants to capture them."
Now, the main problem here is a lack of connectives. Let's look at the first two sentences for example:
"Alexander had a taste of power from being in control of his workers and their loved ones. He grew old, and couldn't afford to die at any age."
The full stop doesn't need to be a full stop. Here:
"Alexander had a taste of power from being in control of his workers and their loved ones, but he grew old and couldn't afford to die at any age"
That simple use of a but, makes the sentences flow better into one another. Always say a sentence in your head after writing it, if it doesn't flow off your tongue easily, then rewrite it and make adjustments.
Now, lets look at where you could of used different words/variations to make it flow and read better. Again:
"Alexander had tasted power from controlling his workers and their loved ones, but he grew old and couldn't afford to die at any age." Now, adding the next sentence to that, and using a connective again:
"Alexander had tasted power from controlling his workers and their loved ones, but he grew old and couldn't afford to die at any age, however he had studied and stumbled upon a discovery - a substance called Vitae that had the potential to extend his life."
See? That flows, and reads, and just sounds better generally.
However, the next two sentences concern me:
"He obtained the substance by torturing his workers. He used his servants to capture them."
Not only do you create the same mistakes as earlier, but you make a new one: A lack of explanation. This is really frustrating to read because people may ask a question you didn't answer "Why does torturing his workers give him Vitae?" Again, Let me alter this:
"The substance had to be extracted through torture, and Alexander had the perfect targets: His workers, though the exact reason why this stage was needed in order to create the substance was unknown to him.
Alexander was unable though, to torture his workers - now prisoners - himself as his body was old and weak whilst his servants were young and strong."
Now, that creates a far better sense of intrigue, flows well, and lets the readers know that the main character of this portion of the story has no answer for their question.
Let's put them all together, and adjust to flow better once again.
"Alexander had tasted power from controlling his workers and their loved ones, but he grew old and couldn't afford to die at any age, however he had studied and stumbled upon a discovery - a substance called Vitae that had the potential to extend his life.
It seemed that the substance had to be extracted through torture, and Alexander had the perfect targets: His workers, though the exact reason why this stage was needed in order to create the substance was unknown to him.
Alexander was unable though, to torture his workers - now prisoners - himself as his body was old and weak whilst his servants were young and strong."
I won't address the other texts as this seems to apply throughout, and I hope you learnt a little from this.