Disintegration resistance is useful for preventing instadeaths caused by disintegration. It can be acquired as an intrinsic by eating a black dragon corpse (100% chance) or the Chromatic Dragon's corpse (~17% chance). It can also be obtained by wearing black dragon scales or black dragon scale mail. Disintegration resistance protects against two things: the breath attack of a black dragon, and the wide-angle disintegration beam of an angry god. It will also protect your shield, cloak, body armor and shirt from disintegration breath, but not from a wide-angle beam.