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darya.way13, hello! The player is not required to capture the Elf/Mage Castles **quickly**. Assess the situation, first develop one hero, then another. One will be an attacker, and the second will stay behind to cover your rear. Plus, you can hire someone from the tavern for help. Then, take down the "orange" players one by one (it's not necessary to attack them, but it's desirable – otherwise they won't let you rest 
), then the "blue" ones, and finally the "green" ones. The latter will try to prevent you and destroy your main stack of Ghost Dragons. It’s better not to lose that stack – without Eternal Night, things will be difficult for the undead in these lands. You can approach the "academic" Castle after defeating the mage Hazim; he is located east of the city. I understand that you came to fight the mages on the island without proper preparation, but that's okay – there are no time constraints there either, so there's no need to rush (unless this is a speedrun Walkthrough, of course). The battle in the pyramid is designed so that you cannot win with a quick assault 
. If you decide to go there, it's best to do so after defeating the mages and gathering a sufficiently powerful army.
Those who completed the map on "easy" were likely either very skilled players (who have mastered Heroes more than just playing around) or did so on a very easy difficulty level, or used cheats... The list could go on forever. One of the testers completed it on Hero mode in 4-5 game months / one real day (even though they hadn't seen the map before and couldn't know all the nuances) - I was amazed! And you say...? I’ve been playing Heroes since about the 2010s, and I'm not a master myself, rather an amateur. So go for it, good luck!
), then the "blue" ones, and finally the "green" ones. The latter will try to prevent you and destroy your main stack of Ghost Dragons. It’s better not to lose that stack – without Eternal Night, things will be difficult for the undead in these lands. You can approach the "academic" Castle after defeating the mage Hazim; he is located east of the city. I understand that you came to fight the mages on the island without proper preparation, but that's okay – there are no time constraints there either, so there's no need to rush (unless this is a speedrun Walkthrough, of course). The battle in the pyramid is designed so that you cannot win with a quick assault . If you decide to go there, it's best to do so after defeating the mages and gathering a sufficiently powerful army.
Those who completed the map on "easy" were likely either very skilled players (who have mastered Heroes more than just playing around) or did so on a very easy difficulty level, or used cheats... The list could go on forever. One of the testers completed it on Hero mode in 4-5 game months / one real day (even though they hadn't seen the map before and couldn't know all the nuances) - I was amazed! And you say...? I’ve been playing Heroes since about the 2010s, and I'm not a master myself, rather an amateur. So go for it, good luck!