Talk:Summon Boat
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It is referred in the description of expert level Summon Boat spell, that the spell could fail if all possible 64 boats are occupied. However, boats cannot be summoned if a hero is already in a boat, and there can only be 64 heroes wandering on the Adventure Map at the same time. This leads to a situation, that if all heroes are in the boats, none of them can cast the spell.