The 2nd release of Necromunda, this was original release as "Underhive" in paper form and later made available free as a PDF by Games Workshop as the Living Rulebook Edition.
It has appeared under several acronyms, including ORB (or Online RuleBook), but is now referred to as the LRB. (ORB is now Original RuleBook, the 1st release).
It has appeared under several acronyms, including ORB (or Online RuleBook), but is now referred to as the LRB. (ORB is now Original RuleBook, the 1st release).