Maybe it provided a buffer zone to protect the mind.
Kris and his mate, Hannah – Rhyn's other buffer – weren't about to live the rest of Immortality on the beach with him.
This Lakhmid kingdom was more or less dependent, during the four centuries of its existence, on the Sassanian empire, to which it formed a sort of buffer state towards Arabia.
Siam thus has its independence guaranteed by the two European powers who alone have interests in Indo-China, England on the west and France on the east, and has therefore a considerable political interest similar to that of Afghanistan, which forms a buffer state between the Russian and British possessions on the north of India.
The chief importance of Afghanistan in modern days is due to its position as a " buffer state " intervening between the two great empires of Asiatic Russia and British India.