Hello! Okay so I like the concepts you're introducing with Cenric and the premonitions he sees in his dreams. I think you also did a good job at showing the kind of person Cenric is and the pressure he has to deal with. The mystery you set up about what's going on with Nicola in the dream is also really interesting and a nice hook.
So, I do see some issues with tense usage with you switching back and forth from past to present tense. I know that can be tricky as a non-native English speaker and our writing is honestly pretty good. I'd just be wary of that when looking through the story during edits. The other thing is that there is some odd word usage like in chapter two when Cenric thinks:
If Cenric was Daniil in his dream, why would Daniil fight Nicola and get killed, while everyone he knows is always in glory to tell how deep the friendship between Daniil and Nicola was back then?
The word glory doesn't really fit there, though I can guess through context the idea you're trying to get through. It's just things like that when I suppose it's difficult to pick the right word to fit the occasion. Another example is from Ch 1:
Cenric spreads a thick blanket on the snow, sits down, and starts to talk as if he had all the time in the world, while in fact sunrise is already approaching, just a few hours prior to the Queen's Birthday Celebration.
"General, forgive me, for I have to disturb your sleep when the sun is not even awake yet."
A couple things here, the first sentence is a bit too long so that the point gets lost and by the time we get to the dialogue, I've already forgotten that it's Cenric who is speaking. Saying he starts to talk in the middle of a paragraph, then separating the dialogue creates too much distance between the two. The first sentence is also worded in a confusing way, especially the latter part. Here's a quick rewrite that addresses some of these things:
Cenric spreads a thick blanket on the snow.
"General, forgive me, for I have to disturb your sleep when the sun is not even awake yet," Cenric speaks as if he had all the time in the world. In reality, sunrise quickly approaches, leaving only a few hours before the Queen's Birthday Celebration
One thing I was wondering is how Cenric so quickly comes to the conclusion that he was seeing things from Nicola's perspective in his dream. Seeing his thought process as to how he arrived at this conclusion would be nice. It just feels a bit sudden as it is, but that was an interesting point to end the first chapter on. In contrast, the second chapter ends a bit anti-climactically.
In general, the story is actually pretty good and, again, has some interesting ideas. The mystery of Cenric's dreams and what happened between Nicola and Daniil is intriguing. It really just needs to be polished some more, which I know is tough when English isn't your first language because it can definitely be a tricky language to work with(native Spanish speaker, haha). Your story has a lot of potential and a lot of the issues I see are things that can be improved with practice and reading. Look at how things are structured and worded in other fantasy books you enjoy, think about how certain word choices can change the mood of the story.
Best of luck in your online writing journey. I think you have a lot of promise with this being your first online novel and you definitely have some cool ideas!