This metal hat looks like a typical helmet. If detect magic is used, the emanations are indeterminate. Once placed upon the head, however, its curse immediately takes effect, and the alignment of the wearer is radically altered-good to evil, neutral to an absolute commitment (LE, LG, CE, CG) as radically different from the former alignment as possible. Alteration in alignment is mental and, once effected, is desired by the individual changed by the magic.
Only a wish or alter reality spell, can restore the former alignment, and the affected individual will not make any attempt to return to it. A paladin must undergo a special quest and atone, if the curse is to be obliterated. Note that once a helm of opposite alignment has functioned, it loses all of its magical properties.