Antler of the Blue Stag

The Antler of the Blue Stag is an ancient relic that is said to be a fragment of the first animal slain by mortals. It’s said that Taal granted this animal to the first men as a sign of his blessing and protection. The Antler (or facsimiles of it) has changed hands many times over the centuries, manifesting in one village only to vanish once again once a threat has passed. It has never appeared in a city, except for one event: Some claim that it was carried by Valten during the siege of Middenheim. Now, the community of warriors that claims ownership of this relic gains greater skill in combat, be it melee or ranged.

Source

 * Warhammer Fantasy RPG 2nd ED -- Tome of Salvation (pg. 249)