avendeen said:
Are the Tleilaxu and their Face-Dancers a class or race?
Face Dancers were specifically engineered for their profession. It also requred intense training. It was not something that could simply be learned. Most Tleilaxu, on the other hand, did not seem to be extremely different from humans in general, but they were very isolated, due to their dabbling in forbidden arts.
Are Tleilaxu Gholas and Guild Navigators a Template?
Ghola might be a template. Guildsmen were essentially a distinct race.
Bene Gesserit as a base class and Reverend Mothers a prestige class?
That could work. Most Bene Gesserit had very little to no special abilities, as far as I could tell. They were just nodes in an information network. So most Bene Gesserit would actually not even be of a Bene Gesserit character class.
What are the game affects of Melange?
It granted prescience. It extended lifespan. Its greater powers required a hereditary component (plot hook) in the user.
Let's not forget Suk Doctors.
Except that nothing at all was said about them outside of the (false) presumption that they were unbreakably loyal.
What about personal shields?
In game terms, they essentially gave infinite AC against any ordinary projectile (including thrown knives) and against melee attacks delivered normally. Getting a weapon through required specific training, and many nobility only trained against shields, giving them a potentially fatal weakness in unshielded combat.
To reflect the Dune setting best, presume that combat vs. a shielded opponent was considered the norm. However, against an opponent skilled in unshielded combat (when one is not wearing a shield), one suffers a penalty to AC and to hit of two or more. A Feat eliminates this penalty. Fremen do not have this penalty, but they have to take a Feat to fight against shielded opponents.
When attempting this setting, we must not forget Peiter DeVries's statement that Baron Harkonnen's own non-Mentat abilities far exceeded those pathetic machines of past eras.