Grand Master Engineer Williume Blitzcog searches an old Gilnean House. The Moonlight glistens throughout the abomination of a structure. As a small gnome, Blitzcog will take ages to search the house entirely. Thus is why he made a small army of bots, the item must be here somewhere. With years of research and brutal interrogations behind him, he was sure of it. He couldn't let anything like this into someone elses hands, it would just be apocalyptic.
First, who is Grand Master Engineer Williume Blitzcog? Why do we care about his search? You introduce this character with this long title, and his search seems to be so important, but--what for? Just to add another schematic to his Grand Master pile?
I'd suggest changing "glisten" to stream, or "bathes the structure" in some creepy kinda glow. "Glisten" implies a thing is wet, and moonlight isn't.
Why does this gnome consider Gilnean architecture an abomination? Does he not like stereotypical 1800s English design?
Don't imply how long it might take to search in such a manner. It signals to the reader "Good lord, this will take so long and be boring". And, gnomes aren't that small and incompetent, compared to taller folk.
Who interrogated him, and why? Why is this new bomb design so important in a world of hundreds of other kinds of bombs and explosive magic? Why would it be "apocalyptic" if it ended up in hands that aren't his?
He presses every wall with his tiny palms, every large book shelf and every odd placed lamp in the giant house. Thousands of gnomes could pile up on top of each other and around but that still wouldn't be the size of the house he thought.
This is sounding more like a castle than a house. Gilnean homes aren't any larger than Elwynn homes.
He whips out a slip of paper, "Mega Seaforium Charge" the title reads, all the statistics and schemata are on the page. But the items are the hardest to get. Some are scattered around the Outlands and in the outskirts of Northrend. But those metals or gases are now extinct in Azeroth. Over exposed to some other evil projects. Besides that, he believes that this is the last one in the face of Azeroth and the Outlands, besides the one that a famous engineer has created in the past, which has been disassembled.
Where does the paper come from? How did he find it? What metals are you talking about? What does he believe is the "last one in the face of Azeroth and the Outlands"? Who is this famous engineer? Why was this thing disassembled?
I'm still not catching why a reader should care about any of this. You keep implying this stuff is important only because you say so. "He's famous because he's famous".
If this has been used as a war weapon it will destroy the city of Stormwind or even Orgrimmar, he's sure of it! He doesn't want this being used for evil, of course. Blitzcog has always been dedicated to neutrality and goodness. But this may change his views entirely.
Again, in a world of far more destructive magics, a bomb like this is a raindrop in an ocean. And why do we believe this Blitzcog has been dedicated so? Why do we care? We have no idea who this person is, only that you say stuff. Why would this change his views?
"Kheeeeeerrrr" his thoughs stop immediately. Was that a door way? He starts to shake lightly with fear, and even excitement. Has one of his bots discovered a secret door upstairs?
Where did the bots come from? They should be mentioned earlier on, otherwise it seems like a plot point or power pulled out nowhere for convenience. Also, with the searching bots, why would it take "ages" for this gnome to explore the house, as you stated earlier?
He teleports to the stairwell using a famous magi spell named "Blink" he begins to climb the stairwell, all four stories...
A tip for writers is to write as if your audience has never heard of what you're describing. Imagine if J.K. Rowling described all her magic as "Harry used that famous spell Wingardium Leviosa". We'd be left going "...ok, what the hell is that, and why should we care?". Instead, write like this:
After shaking off the anxiety brought on by the distant, eerie creaking, Blitzcog steadies his gait and focuses on the stairwell. Positioning his hands, fingers bent to channel the ensuing magics, he speaks in the Arcane tongue--bamf! An observer might have a second or two to watch the magic at work before they spot him on the steps.
And, four floors aren't that much. Gnomes are small, yes. But they aren't incompetent.
He reaches the pinnacle to the house, a bot sits beside a wall, that is opened. The light on his head is blue. The doorway leads down the abomination of a chimeny...
Again, where did these bots come from, and why aren't they mentioned earlier? Why does it matter the light on his head is blue? Why is there a door leading to the chimney? Why is the chimney an abomination? I'm not sure what you mean by "pinnacle to the house". Is he in the attic?