The Well of Sins was the very first Lazarus Pit, built under Eth'Alth'Eban, it contained the most concentrated supply of Dionesium. Thus, it was of the most pure of all the Lazarus Pits, but also the one that resulted in the most evil from it's users. This was seen after the Untitled drank from it and when Ra's al Ghul used the Untitled to restore it to full power. All other Lazarus Pits were run offs of the Well of Sins, at one point having had been connected via underground tribituaries.