Glaive Lord and Bloonjitsu are ancient techniques of Monkey martial arts whose knowledge is stored in these archives.
~ Official BMC description

Archives of Ancient Knowledge building

The Archives of Ancient Knowledge, known as Archives of Knowledge in BMC Mobile, is a Special Building that is required for research of the Glaive Lord and Bloonjitsu upgrades. It costs City Cash30,000 to build, takes 48 hours to build, and gives 500 XP once construction is complete. It consumes Lightning thing-0.png40 and a 1x1 tile space. It requires Level 18 to unlock. The Bloonjitsu upgrade costs an additional City Cash25,000 as well as the Glaive Lord upgrade costing an additional City Cash18,000.

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