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It's not really necessary, but in my opinion, you can spend 300 rubles to get 2 bosses, 2 favorite creatures, several heroes, and additional buildings on the map (like hiring neutral creatures, such as wolves and mermaids) – I haven't seen these in other campaigns, 2 dynasty weapons, and the maps are very beautiful.
I still recommend spending the money:)[/QU
Thanks for the answer. Then, one more question: can you provide a link or tell me where to buy all the expansions, because on the official Ubisoft website, they cost 10 euros each, and Shades of Darkness costs 20 euros, which adds up to a significant amount (like 2 expansions at 10 euros each and the 2.1 patch for 20 euros).