Aldarc
Legend
It seems like there are some fairly easy ways to tie psionics into the setting themes:
The Gods Are Dead: the gods are dead, and psionic power represents the leftovers of divine will/power in Athas. Psionics are the last gift the gods gave to the inhabitants to persevere over the dying world. It's ubiquity means that it's a form of power that the dragon-kings can't wipe out or quash as they could arcane magic, and the DKs mostly tolerate it as it doesn't compete with their defiling magic.
The Gods Are Dead: the gods are dead, and psionic power represents the leftovers of divine will/power in Athas. Psionics are the last gift the gods gave to the inhabitants to persevere over the dying world. It's ubiquity means that it's a form of power that the dragon-kings can't wipe out or quash as they could arcane magic, and the DKs mostly tolerate it as it doesn't compete with their defiling magic.