Rogue/Items

Armor
A higher AC gives a better chance to avoid damage.

Scrolls
Some scrolls require certain conditions to be met. If they aren't, you see the message "you feel a strange sense of loss".

Rings
The rings that provide bonuses may either give +1 or +2, but can also be cursed and give -1 instead.

Rods
Rods can either be wands or staffs. While there are differences between them, they are minor.

Staves normally appear with 3-7 charges.