The Brotherhood of Grimnir represent the most dedicated of all the slayers, and are often the most experienced (and therefore unsuccessful) of their kinsmen. The status of other slayers is dictated by deed; the larger or more deadly the beast they have slain, the greater the respect afforded by their contemporaries, though this is a fairly loose system.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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If Ungrim is included in your army, one unit of Troll or Giant Slayers may be upgraded to the Brotherhood of Grimnir for 1 point per model. These Slayers have the Wards of Grimnir upgrade.