Priest Spells Beyond 7th Level (DK)

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Priests who advance beyond 20th level gain not only additional spells of levels 1 through 7, but also begin accumulating the ability to cast spells of levels eight through ten. These are far-reaching, powerful spells affecting large areas, but are essentially gained in the same manner as lower-level spells-the priest requests them from the powerful beings of the elemental planes. 
Preparation time: In addition to the normal list of game statistics preceding priest spells, 8th-through 10th-level spells list a preparation time. The priest must fulfil this requirement before the spell can be cast. If the priest must perform a specific task during preparation time, or if he can spend only a certain amount of time per day actively preparing, these are noted in the spell description. Unless otherwise stated, if the priest is interrupted for even one day during the preparation time, the spell will fail. Preparation must be started over. 
Often the preparation time directly governs the duration of the spell. In such cases, the preparation time is optional; the priest can spend just as much time as he wishes preparing for the spell, within the restrictions listed with the spell. 
Typically preparation time does not take every hour of the day. During the remainder of the day, the priest can perform other tasks, including adventuring, research on other spells, even preparation for other high level spells (within restrictions; see below). Spell preparation s may somewhat restrict the priest's range of movement. If these restrictions aren't strictly adhered to, the preparation time to date is void and the spell will fail if cast. 
Unless otherwise stated, the priest casts the spell on the last day of preparation time. If the priest waits more than a day afterward to cast the spell, those days are subtracted from the preparation time already accumulated. 
Casting multiple spells above 7th level: The preparation times for spells higher than 7th level are so long that priests rarely actually cast more than one in a day. If, however, the priest manages to conclude the preparation times for multiple spells of 8th level or higher on the same day, use the Priest Spell Progression Table's numbers as the maximum he can cast per day (see page 56). 
More significantly, the Progression Table's figures for 8th, 9th, and 10th-level spells limit the number the priest can prepare at any one time. The priest must also be able to devote the preparation time to each spell. For example, a 24th-level priest could be preparing two 8th-level spells and one 9th-level spell at the same time, provided all three preparation times add up to 16 hours or less (assuming the priest needs to sleep eight hours per day). If he finishes his preparation time and casts one of the 8th-level spells, he can then begin preparing for another 8th-level spell immediately. 
A priest may use magical means to get better use of his time; it is perfectly legal to use time spells to get more than 24 hours out of a day.