Hello, this is looking seriously interesting.

While I work on my charactersheet, I'd like to anticipate the general idea of my clan:

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After the arrival of the Fire Faith misioneers, my clan stood firm in their old believes, but was overwhlemed and forced to the Clicking galleries of the Dark Below. The clan, forgotten, threatened by starvation, surrounded by untold horrors, became both feared and respected by the Silent Ones. Somehow, they adapted to the deadly miasma and other poisons, and most importantly to herd the Clikers. from who they learned their secret paths. 

Recently, few generations ago, a section of the ground floor dried up and a way to the Mall was opened. Small scouting parties, then huntng raids and recenty traders of this stinky, strage rat-folk have been seen in the peripheria of the great clans. 
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TL: Insect-handlers, adapted to miasma, knowers of secret paths and Clikers-lore