PReDS
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It seems that the specifics of mana storage haven't been mentioned yet, but for offline play, this is often a crucial factor (especially in the second game, where DD is not limited).
Thirdly, if you manage to obtain a mana reserve exceeding 10 times your current knowledge skill (without considering intelligence) through some means (wearing a helmet, visiting a well, removing the helmet), nothing happens to it until you spend it.
Secondly, the maximum mana depends on your current knowledge skill and is equal to 10 times the knowledge skill after visiting a well or spending the night in a town with a guild, or 20 times the knowledge skill after visiting a magic source. Any decrease in knowledge will result in a decrease in the mana reserve, even if you simply move a scroll from one cell of the hero's backpack to another; your mana will be reduced to the level of knowledge without that artifact.
Thirdly, if you manage to obtain a mana reserve exceeding 10 times your current knowledge skill (without considering intelligence) through some means (wearing a helmet, visiting a well, removing the helmet), nothing happens to it until you spend it.
Secondly, the maximum mana depends on your current knowledge skill and is equal to 10 times the knowledge skill after visiting a well or spending the night in a town with a guild, or 20 times the knowledge skill after visiting a magic source. Any decrease in knowledge will result in a decrease in the mana reserve, even if you simply move a scroll from one cell of the hero's backpack to another; your mana will be reduced to the level of knowledge without that artifact.