CRB第208页提到过一句。
Bonus Types: Usually, a bonus has a type that indicates how the spell grants the bonus. The important aspect of bonus types is that two bonuses of the same type don’t generally stack. With the exception of dodge bonuses,most circumstance bonuses, and racial bonuses, only the better bonus of a given type works (see Combining Magical Effects). The same principle applies to penalties—a character taking two or more penalties of the same type applies only the worst one, although most penalties have no type and thus always stack. Bonuses without a type always stack, unless they are from the same source.
理论上来说不同来源的,例如精工工具和魔法提供的环境加值是可以叠加的,这一部分应该是继承自d20规则。至于那个most,应该是用来限制200G一个的+2技能精工工具无限叠的套路。