I really like the fact that if you die, your descendant inherits your completed credos.
But why are subsequent credos cheaper after each death? This just encourages suicide (for large groups, at least), which feels weird. I think this should be removed.
If you want to simulate the descendant not having to follow the same path as their ancestor, allow us to "abandon" unwanted completed credos to make getting new ones cheaper (perhaps getting back the initial LP investment the ancestor made - in a roleplay sense this could simulate a free-thinker forging their own path instead of just doing what their ancestors did).
Obviously you shouldn't be able to abandon credos which are prerequisites for other credos you also have completed (or started), without abandoning those as well.