The Dark Sun setting, on the other hand, was designed with an eye to providing a world that could tie into the major supplemental additions to the AD&D system – as well as psionics, it was also supposed to rely a lot on the Battlesystem mass combat rules, though poor sales of that meant that its significance was dialled back considerably in the released version of the setting. Back when I reviewed The Complete Psionics Handbook, I noted that part of the problem psionics faced was that most official D&D settings had been designed without really making much of a space for it, so we were left without a model for how it could be used in a game and integrated into a setting that also had clerical and arcane magic.