Foresight School
Associated School: Divination.
Replacement Powers: The following school powers replace the diviner's fortune and scrying adept powers of the divination school.
Prescience (Su): At the beginning of your turn, you may, as a free action, roll a single d20. At any point before your next turn, you may use the result of this roll as the result of any d20 roll you are required to make. If you do not use the d20 result before your next turn, it is lost. You can use this ability a number of times per day equal to 3 + your Intelligence modifier.
Foretell (Su): At 8th level, you can utter a prediction of the immediate future. While your foretelling is in effect, you emit a 30-foot aura of fortune that aids your allies or hinders your enemies, as chosen by you at the time of prediction. If you choose to aid, you and your allies gain a +2 luck bonus on ability checks, attack rolls, caster level checks, saving throws, and skill checks. If you choose to hinder, your enemies take a –2 penalty on those rolls instead. You can use this ability for a number of rounds per day equal to your wizard level. These rounds do not need to be consecutive.
问题1：Prescience描述中的替换投骰能力，请问是每轮只能替换一个d20还是该轮可以任意替换d20？
举例：假如prescience骰出了19，并且在该轮内被对方准备动作的法术击中，那么在使用19来替换豁免骰以后，还能用19来再次替换射线的攻击骰吗？
虽然我个人的看法是不行但是好像没有官方说法的样子于是就来问问……
问题2：Foretell的加值是幸运加值，那么假如用Foretell造成减值，那个减值是什么类型的呢？
（另外Foretell的减值没有豁免对吧？
谢谢各位
