This is a fan material document made for Warhammer Fantasy Roleplay 2nd Edition (WFRP2). It lists all WFRP2 creatures by slaughter margin, provided that they have a slaughter margin and are from books published by Black Industries or Fantasy Flight Games.
Slaughter margin is a system introduced in Old World Bestiary. It is used to track combat difficulty.
You can find this document from WFRP2 Rules -page.