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***The Celestial Temple xenology files***
Dax symbiont
halfway out
A joined species comprised of a humanoid host and a small vermiform symbiont that lives in 
an internal abdominal pocket of the host body. Most of the personality and memories of the 
Trill reside in the symbionts, which are extremely long-lived, although the host also contributes 
personality traits to the joined life-form. Upo the death of a host body,  a trill symbiont is usually  
transplanted into another host. For a joined Trill, nothing was more important that protecting 
the life of the symbiont. 

Trill hosts enter voluntarily into their association with the symbiont, and in fact there is intense 
competition among potential hosts to determine who will be accorded this high honor. Only one  
Trill in ten is chosen to be joined with a symbiont. The decision of who is to be allowed to be  
joined is the resposibility of the Symbioses Evaluation Board. Although this Board tells the  
Trill people that improper joning is believed to cause damage  to both host and symbiont, friends 
of Jadzia Dax, when she fell ill in 2371, learned that nearly half the Trill population was capable 
of being joined. This fact is concealed by the Symbioses Commision though, for fear that the 
symbionts, available in limited numbers, would become commodities to be bought and sold.  
Dax's friends agreed to keep this secret in order to gain commision assistance to save her life 

Children are directed by their parents towards becoming a host. While the influence of the  
symbiont is very strong, good host candidates can balance the influence of the symbiont with 
their own interests, and hence produce the best possible merge of the two personalities. 
Hosta are accepted i their mid-twenties. once joined, the host and symbiont become biologically 
interdependent, and after 93 hours, neither can survive without the other. The resulting new joined 
life-form is considered to be another person, although it retains memories of previous joinings. 
Despite the fact that a symbiont retains memories in subsequent joinings, Trill society very  
strongly disaproves of reassociation of subsequent hosts, in cases where previous hosts had  
been married 

Trills'  hands are naturally cold. Sometimes friendships with other species don't survive when the 
Trill moves to the next host. Trills are highly allergic to insect bites, as the toxins released interfere 
with the biochemical connections between the host and the symbiont. Trill hosts sometimes have 
sexual feelings, but they do their best to rise above them. They do not have to uphold commitments 
of the previous hosts.