Some effects in the game affect "allies". In game terms, an ally is simply anyone who you consider to be your ally in the current scene. If an effect specifically targets allies (and not simply creatures or characters), you cannot use it on yourself.
While playing, you will sometimes need to halve numbers or divide them by a certain value. When this happens, always round down to a minimum of 0.
If you ever need to perform multiple operations on the same number, you must do so in the following order: additions → subtractions → multiplications → divisions.
If a specific element of the game contradicts a general rule, that specific element will take precedence. Example: Normally, a Player Character cannot equip two shields at the same time. However, the Skill Dual Shieldbearer (page 197) allows you to do so!
Sometimes a rule or effect will cause multiple choices or effects to trigger, and it will be important to know who gets to act first.