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Tol-leaf
Tol-root

Tree-of-Life is a perennial bush native to the Pak homeworld. The bush is found on Earth as yam, but the virus did not survive. When grown with Thallium oxide the Tree-of-Life root is infected with a symbiotic virus.[1]

Its smell is unnoticeable or unpleasant to breeders until they reach about 35 Pak years (or 42 human years[2], i.e. early middle age); after that, the smell suddenly becomes irresistible.[2] Even if too old, hominid breeders are still irresistibly attracted to the root's smell.

The breeder gorges on the root, infecting himself with a symbiotic virus in the root and triggering the transition; an enzyme works profound changes at the cellular level of the Pak causeing apparent, emotional and intellectual transformations.[2]

The age window for the metamorphosis is relatively narrow. If a breeder is just a few years past early middle age, the virus in the root will kill him instead. (This is not a problem on the Pak homeworld, where Tree-of-Life is readily available to any breeder that reaches the age of transition.)

After consuming Tree-of-Life root, Pak breeder forms (and their offshoots, such as humans) turn into the Pak Protector form. Once the transformation is complete, a Pak Protector must periodically consume more Tree-of-Life root to maintain the virus in its body. Without the virus, the protector will weaken and die. A protector can survive indefinitely on Tree-of-Life root, although it can eat other types of food provided Tree-of-Life root is a regular part of its diet.

References
  1. Database
  2. 2.0 2.1 2.2 Concise Encyclopedia

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