Erictho, Tartarorum Terror is an all-Latin tiered reader offering selections from book six of Lucan's epic poem De Bello Civili (also called Pharsalia). Its goal is to bridge the gap between didactic materials and authentic Roman literature. Each selection has been rewritten in two different levels of Latin so that the intermediate or advanced reader is able to seamlessly progress to the original poetry while staying in the target language. There is also a Latin-Latin glossary and Latin notes for each passage, as well as a Latin introduction to prosody and metrics.