The Iztris cannot name a single creature that was not mortal at some point - the only fully immortal beings they can imagine are the great gods, the only truly perfect gods among them. The Iztris were once mortal - and so were the gods they served. Mortality tainted the creatures, and when immortality was granted, the Iztris knew those taints remained. Therefore, no creature can escape the flaws of mortals - the flaws of humans.
