The trailer story of Shadow of War could be about the power struggle in the game's universe. It may feature the different factions vying for control. For example, we might see the hero trying to unite various groups against a common enemy, which could be a powerful and evil warlord. There could also be elements of betrayal and redemption as the story unfolds within the trailer.
In most cases, it is legal. Fanfiction is a form of creative expression by fans. As long as it doesn't violate any copyright laws in a major way, like using the exact same footage from the trailer without permission in a way that undermines the original work's marketability. But if it's on a legitimate platform that respects intellectual property, you should be okay.
The God of War Ragnarok trailer shows Kratos and Atreus facing new challenges. It seems they are up against powerful foes as they continue their journey in the Norse world. There are epic battles and a sense of impending doom as Ragnarok approaches.
I'm not entirely sure as there could be many novels with the term 'war room' in the title. It might be about military strategies and operations that are planned in a war room setting.
A 'war room story' might also be in a business context. For example, in a high - stakes business deal, the war room could be where the top executives gather to plan their marketing strategies, deal with competitors' moves and figure out how to gain an edge in the market. They analyze data, discuss different scenarios and make crucial decisions to win in the business 'battle'.