Enervation法术说明:
If the subject has at least as many negative levels as HD, it dies.
conditions的Energy Drained一节:
If the subject has at least as many negative levels as Hit Dice, he dies.
但是hydra的特殊能力,没有声明在获得负向等级的时候少一次攻击。也没有声明,其有效HD与其可以拥有的头的关系:
A hydra can never have more than twice its original number of heads at any one time, and any extra heads it gains beyond its original number wither and die within a day.
注意只是与original head相比,而非HD
此外,我不知道楼主怎么算的总能离hydra 45ft的……好人最开始在角落,hydra完全可以进到离这个角落20尺的地方的水面。这样好人除非双移动,不然都逃不出hydra单移动20尺+体形15尺的范围被喷吐……而双移动了便放不出法术