scroll of enchantment
A new item, similar to scrolls of defense/protection, but altering "magical" items (non-artifacts that grant bonuses to stats, like girdle of strenght, amulet of perseverance, boots of sneakiness, etc). Reading it would increase its stat bonus. The higher bonus, the harder to increase even more, as usual.
cursed - lowers bonus by 1
uncursed - raises bonus by 1 (with a chance of failure depending on current bonus)
blessed - raises bonus by 2 and/or has a better chance not to fail