Ley
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Why would the main hero need literacy? He will probably visit all the castles anyway, and he will capture them himself.
What's the point of asking such questions? I already wrote that only in the case when there is NO CHOICE, well, if all the experts give literacy to the main hero, what will you do? :) Otherwise, it's clear that a "secondary" hero should do this...
Added after 3 minutes
Well, yes, it's great to put such a skill on unimportant heroes, by the way, does this skill work when entering a Sanctuary???
Of course, it works, it's strange that you even asked...:)
"Единственное, что можно сказать с уверенностью об удаче - она изменит..."