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I decided to add another note, which became clear after many games on this map:
- It's not entirely fair to give the red player the necklace and the blue player the hat, which automatically adds the "Summon Ship" spell to their spellbook. This means there's no need to complete the quest for the blue player; they can simply use the hat....
The same applies to the AI playing against the blue player. After defeating the blue player, it receives the hat and can summon a ship and land in an area that was previously inaccessible....
In a duel between human players, the blue player gains an undeniable advantage (of course, in a fair game, the quest will be completed, but there is sometimes no guarantee of a fair game).
In a single-player game, the AI for the blue player, if it survives against the AI opponent in the dungeon, will use the hat instead of completing the quest, or the AI will use the hat at a certain point....
Therefore, I suggest making the following change:
Make the quests for the blue and red players the same - bring the necklace.
This will prevent the blue player from skipping the quest.