A torn prayer scroll is a possible reward from the Chambers of Xeric. Reading it allows the player to unlock the Preserve prayer.
A player reading the prayer scroll.
When the player reads the scroll, the chatbox message states You can make out some faded words on the ancient parchment. It appears to be an archaic invocation of the gods! Would you like to absorb its power? (Warning: This will consume the scroll.)
If a player reads the scroll while already having unlocked the prayer, the chatbox message will state You can make out some faded words on the ancient parchment. It appears to be an archaic invocation of the gods. However there's nothing more for you to learn.
|12 January 2017
The torn prayer scroll was made separate from the rarer prayer scroll that would unlock Rigour and Augury so that the cost of Preserve would not be tied to the much higher cost to unlock the other two prayers.
For an exhaustive list of all known sources for this item, see here