
Touhakuden: Maou Reijyou kara Hajimaru Sangokushi is a Japanese novel of 648,459 characters, with 19,898 unique words and 2,559 different kanji. Its difficulty rating on Jiten is hard, 3.6 out of 5. The full vocabulary list ranks all 19,898 words by how often they appear, and you can study them on Jiten or download them as an Anki deck.
Here are some of the words that appear most often in this media, as well as a sample of its rarer vocabulary.