Kapi is the poison the Adama family uses to return to the soil. William Sr. and his wife, Isabelle, give it to their sons, Joseph and Samuel when they were children. Their parents have knowledge of the Ha'la'tha resistance. Their enemies could use Joseph and Samuel against them to acquire this knowledge. ("Dirteaters") Joseph and Sam use the kapi to kill the Guatrau to avenge Willie's death. ("Apotheosis")

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