There are no tomes.
ENDGAME SPOILER SPOILER SPOILER
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You lose some of your stats permanently later in the game, and just before the games final battle you get a permanent plus +1 to two of your stats, or a permanent +2 to one of them.
EVEN MORE ENDGAME SPOILER SPOILER SPOILER SPOILER
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Play a multi-player game with just you, then when you get to the time when you have all 5 tears, give them to another of your chars, save the game, use four of the tears, export your char, load the game, insert your newly exported char instead of the one in the savegame, use four tears again, export char again, load and insert char again, do this till all of your stats are at 25 at which point you don't really gain that much by doing it
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