A useful
NetHack scroll. When read, the
uncursed version will add 1 point of
enchantment (one "
plus") to and
uncurse one
random item of
armor you are wearing. The
blessed version adds +1 to +3 and
blesses a
random piece of worn
armor.
The cursed version, of course, removes a plus from a random piece of armor and curses it, too.
This enchantment process can fail. If it fails (which has a random chance of happening if you try to go past +7), your armor will evaporate.