Ecology- Dune Chronicles, Hellstrom's Hive
Genetics- Dune Chronicles, Hellstrom's Hive, Eyes of Heisenberg
Sterile low-caste members: Workers in Hellstrom's Hive, Tleilaxu Face Dancers in Dune Chronicles, Sterries in Eyes of Heisenberg
Women converted into artificial wombs: Axlotl tanks in Dune Chronicles, Stumps in Hellstrom's Hive
Secret hand language- Couriers in Eyes of Heisenberg, The Hive in Hellstrom's Hive, Bene Gesserit in Dune Chronicles
Immortal being(s) ruling society as the head of a religion- Optimen in Eyes of Heisenberg, Leto II in God Emperor of Dune
Super-weapons- Unnamed planet sterilizer used by the Honored Matres in Heretics of Dune, Project 40 in Hellstrom's Hive
Head of Military/Security who is eventually killed by his Superior(s) but always duplicated and returned to life- Max Allgood in Eyes of Heisenberg, Duncan Idaho in God Emperor of Dune