Is it a real PC game? Is it a new game or hardcore style old text MUD or something? Because I absolutely must play this game!

Cultist Simulator, maybe?

Why do you need flowers?

It is a real PC game from 2000s. And yes you must play this game. Everybody should
Nope
To make some perfumes

Please describe the game's graphics and camera point (first person, third person, etc.). Is it some kind of strategy game with resource management like The Guild?

Now, that's pretty funny... it's definitely some kind of strategy game with resource management like The Guild. Mainly because it IS The Guild ;) You can pay some rascals to beat up people which will decrease their lifespan. Since my husband is pretty old I'm quite sure it will kill him and I'll inherit this nice foundries he own. I'm aware that's not exactly "assassination" but I didn't want to make it too easy. Apparently it was anyway. Your turn.

I am a war veteran hoping to forget the great battles against evil king and his army of necromancers. Traveling throughout regions in search of a remedy for my nightmares. I finally reached my destination. But a new threat is upon us, I have to help local people fight the remaining necromancers and defeat them once and for all.
Strangely enough was to find out that dragons now live in peace with elves and dwarves.

It's a strategy game, available on GOG.

<huge hint above>
<new grammar fixes> (work in progress)

Rage of Mages II: Necromancer

No, it's not it.

Heroes Chronicles

So close...

so far I can say you play as a whole bunch of different characters and you go insane.

So very close! But why 5?