Teachings of Admonition

To obtain Teachings of Admonition, you need to challenge the Domain of Mastery: Full Moon on any level at the Steeple of Ignorance Domain in Sumeru.

To challenge Domain of Mastery: Full Moon I, you'll need to be at least Adventure Rank 27. It is only available on Mondays, Thursdays, and Sundays. Challenging this Domain at higher levels will reward you with more material drops. To claim the rewards, you'll need to spend 20 Resin or use a Condensed Resin to receive double. You do not have to claim the rewards if you choose not to do so.

Check the image below for the Domain's exact location:

Talent Level-Up material. Admonition is the branches of the nation of wisdom. Admonition comes from a pure heart. Only sensible words of goodwill can express profound wisdom and free the sprout of knowledge from the shackles of arrogance.