Terra Archive

Terra Archive is an unofficial Arknights fan project offering a broad collection of English-language reference tools, guides, and simulators for players. Its operator archive organizes characters by faction, class, tags, and synergies, while handbooks cover enemies, stages, items, and story artwork. Players can enter their roster into the RIIC Base Auto-Planner to generate a base layout, use the Public Recruitment Helper to identify guaranteed picks from tag combinations, and consult the Material Farming Helper to find efficient stages. Additional tools calculate upgrade costs, compare operator damage, simulate stage enemy movement, and help plan or simulate gacha pulls.

The site also provides event information and guides for modes including Integrated Strategies, Reclamation Algorithm, Stronghold Protocol, Stationary Security Service, and Contingency Contract. Story content is available as AI-generated digests and full scripts. Users can link a game account to view training, depot, and progress information in one place. Terra Archive is an independent fan resource; its site notes that in-game names and data belong to Hypergryph, Yostar, and their respective rights holders.