Baldur's Gate Wiki:Game source files/2DA/LOREBON

LOREBON, short for lore bonus, is a 2da table that defines the bonus or penalty of a characters intelligence and wisdom scores to their lore value. The table from the original games might have been considered containing a "bug" by the developers of the Enhanced Editions, as the bonus for a score of 15, which is equal to the one for 16 originally, is lowered slightly. However, as such irregular curves also appear in other tables, and as "lore" in terms of the Baldur's Gate series hasn't an equivalent in the Advanced Dungeons & Dragons 2e pen-and-paper rules, this might as well have been intention by the original developers, rather than an oversight.