Defeat Ash Tatars in the soil around Shrine of High Castor to collect tatar's roots. Then, talk to Luis Garcia at the Cave of Altar. Use your quest tracker to see your progress.
Luis Garcia: Come to think about it, did tatars remind you of Luis Garcia: anything? NakanoAzusa: I was surprised when I first saw them. They aren't NakanoAzusa: plants or animals. They're just creatures that resemble NakanoAzusa: banas. HiiragiKagami: But we're used to them now! Luis Garcia: They are one mysterious kind... It's been a while Luis Garcia: since they were first discovered, but no research has Luis Garcia: been done about them. NakanoAzusa: When peace comes back, there will be an NakanoAzusa: opportunity. Luis Garcia: But I would like to lay the foundation for the Luis Garcia: scholars in the future. If I start it off, my Luis Garcia: descendents will be able to complete the research... NakanoAzusa: That's a great idea. I could gladly give you help since NakanoAzusa: it's for the good of the academics of Lakia. HiiragiKagami: Just like those parents who want their children to HiiragiKagami: be good students since they weren't one during their HiiragiKagami: days? Luis Garcia: Then could you go get some roots of ash tatars? I Luis Garcia: want to study their body cells.
Reminder Dialog
Luis Garcia: Watch out for the poison attacks! They're fatal!