The IPD Labs I.P.D.ラボ, aipidi rabo?, lit. "IPD Laboratories") are a research center located in the deeper areas of the Second Tower of Ar tonelico, below the Slums and above Lakra. This place is only known to personnel of the Grand Bell of the highest ranks, and to members of the Sacred Army that have managed to extract information from the Grand Bell, and it's the final destination of the IPDs that are captured by the Grand Bell Knights during their containment missions, as they are used in experiments to increase their combat abilities. Given its top secret nature, the citizenry doesn't know anything about this place or the things that happen in it.