首先是原文
万法p55
All creatures in the area with fewer than 0 hit points that fail their saving throws die, and you gain 1d8 temporary hit points and a +2 bonus to Strength for each death caused by this spell and until the spell's duration expires.
Additionally, your effective caster level increases by one per death caused by this spell, to a maximun increase of half your original caster level, improving spell effects that are dependent on caster level. (This increase in effective caster level does not grant you access to more spells, and it does not increase the duration of this spell.)
万律p22
STACKING
Bonuses of different types always stack. Bonuses that have identical types don’t stack, except for dodge bonuses and some circumstance bonuses. Untyped bonuses stack unless the bonuses come from the same effect.
万律p72
Temporary Hit Points
Through magic or the use of special abilities, a creature can gain a number of hit points called temporary hit points.When a creature gains temporary hit points, note its current hit point total. If the temporary hit points go away through a means other than damage, the creature’s hit points drop to its current hit point total. If the creature has taken damage so that its hit points are equal to or lower than the noted current hit point total when the temporary hit points go away, all the
temporary hit points have already been lost. The creature’s hit point total doesn’t drop further.
Temporary hit points gained from multiple applications of the same effect don’t stack. Instead, the highest number of temporary hit points gained from that effect apply.
If temporary hit points are gained from multiple, different sources that stack, keep track of those sources and when they were gained separately. Any damage taken is first subtracted from the oldest effect that granted temporary hit points.When those are gone, subtract damage from the next oldest effect, and so on.
万律p137
Stacking Effects
Spells that provide bonuses or penalties on attack rolls,damage rolls, saving throws, and other attributes don’t stack with themselves. Two bonuses of the same type don’t stack even if they come from different spells or from effects other than spells.
Different Bonus Types:
The bonuses or penalties from two different spells stack if the modifiers are of different types. If separate spells apply bonuses that have the same type, only the better bonus applies. A bonus that has no type stacks with any other bonus.
Same Effect More than Once in Different Strengths:
In cases when two or more identical spells are operating in the same area or on the same target, but at different strengths,only the best one applies.
Same Effect with Differing Durations:
When the same effect is cast more than once on the same target, the durations of the effects don’t stack. Each effect’s duration elapses normally.
Same Effect with Differing Results:
The same spell can sometimes produce varying effects if applied to the same recipient more than once. Usually the last spell in the series trumps the others. None of the previous spells are actually removed or dispelled, but their effects become irrelevant while the final spell in the series lasts.
One Effect Makes Another Irrelevant:
Sometimes, one spell can render a later spell irrelevant. Both spells are still active, but one has rendered the other useless.
然后个人逻辑，很多都是简化式，意思到了就好：
对衰亡之域的解释采用尽量机翻的方法实现：
如果生物死亡，则得到1d8临时生命，+2力量，+1CL（这个效应我们可以暂称为衰亡之域的子效应）；检查子效应导致的CL,此CL不可超过原始的一半；
这是符合描述的方法且1d8临时生命，+2力量没有被额外的修饰过，适用万律相应条目。
+2力量没有加值类型描述，是Untyped bonuses;+2力量来源于子效应，是the same effect；所以+2力量属于Untyped bonuses stack unless the bonuses come from the same effect，不叠加；
1d8临时生命可做同理类推，区别点在于multiple applications。multiple applications在万律中没有具体解释；applications除此之外只在Cowering出现过，在此处的解释是应用于所有项目上。
把衰亡之域视为a application，可以叠加；
把子效应视为a application，复数子效应符合multiple applications，不可叠加;
修改方法：为子效应添加计数器；如果生物死亡，如无子效应则创造子效应，有则计数器+1，无矛盾且可叠加；
视高等衰亡之域是衰亡之域的子类，符合Same Effect More than Once in Different Strengths，不叠加；
视高等衰亡之域仅内容与衰亡之域相同，可以叠加；
视每个被实现的法术都是独立的，不符合don’t stack with themselves，所以其效应也不符合the same effect，可以重复施展衰亡之域互相叠加CL（至少万律没有CL叠加的解释）和无名力量加值（A bonus that has no type stacks with any other bonus.）.jpg
最后，虽然我因为认为方法应该尽量机翻，所以倾向于统统没法叠。但其实我并不真在乎能不能叠，毕竟需要探索到这层面的没几个，当真碰到了只要DM一个字就能解决，没啥实用价值。万律甚至在一边各种effect的同时，都没解释过effect是什么。我只是无法理解为啥那多人会说这可以叠，无法理解能叠的逻辑而已。
