1-Formateur efrit de l'autel évolué / Strong Altar Imp Trainer
2-Wagon des efrits mineurs / Mine Imp Wagon
3-Prison des efrits / Altar Imp Prison
4-Formateur efrit de l'autel / Altar Imp Trainer

With the new consolidation of traces she no longer give the knowledge for traces of savagery or the other one. I don't know if you have to buy the trace of nature knowledge as I'm past that and it applies to the family. If you did get both trace knowledge you will see 2 trace of nature on the ruin node. Or at least I did.