The main themes in 'War of the Spark Novel' include survival. With Nicol Bolas's grand plan, many characters are just trying to survive. There is also the theme of betrayal. Some characters might betray their allies for personal gain or out of fear. And then there's the overarching theme of change. The events of the war change the power dynamics in the multiverse and also change the individual characters in many ways.
One of the main themes is power struggle. Different planeswalkers are vying for power during the events of the War of the Spark. Another theme could be sacrifice, as characters have to make difficult choices that often involve sacrificing something or someone they care about. Also, the theme of unity against a common enemy is present, as some planeswalkers put aside their differences to fight against Nicol Bolas.
Well, in 'War of the Spark Novel', a major theme is chaos. The war breaks out and brings chaos to the multiverse. Planeswalkers from various backgrounds are thrown into this chaotic situation. And there's the theme of redemption too. Some characters are seeking redemption for their past actions during this intense war. Additionally, the theme of hope is there. Despite the dire situation, there are always those who hold on to hope that they can defeat Nicol Bolas and restore order.