Rigour

Rigour is a new Prayer released on the 19th of August 2010, it increases Range attack by 20% and Range defence by 25%, you must purchase the Scroll of Rigour for 140k Dungeoneering tokens from Daemonheim before you can use it and it requires 74 Prayer to use.

trivia

 * there's a glitch whereby it currently is not listed in the skill (ingame skill  tab with exp etc.)