⚔️Serberia

by the way, since you've been living in Baldur's Gate for quite some time, I'll use green text to describe who's who or give some hints, + the books with Arandor and Fragment work on a question-answer principle (i.e., I explain based on a specific request how it works according to their beliefs).

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So, does that mean one character cannot be the target of effects from multiple other characters? Only one can affect them?

Well, for example, Locken x Plesen means that both receive bonuses from each other, but they cannot receive or give bonuses to anyone else.