The amulet of blood fury is an amulet of fury enhanced with a blood shard, which can only be obtained in Darkmeyer as a rare drop from Vyrewatch Sentinels or by pickpocketing Vyres.
It has the same stats as the amulet of fury, but additionally has a 10% chance of passively healing the player 10% of the damage they deal only while using melee.
Once created, the amulet has 10,000 charges, losing one every time the player successfully damages their target, whether the amulet's effect triggers or not. When it runs out of charges the blood shard breaks leaving the player with only the amulet of fury. For a rough estimate of the amount of health you'll heal with a full charge, take your max hit, subtract 10, and multiply the result by 50. For example if your gear gives a max hit of 50, a full charge with the amulet will provide you with approximately 2000 health worth of healing. When using a 4 tick weapon like the Abyssal whip, one shard will last for approximately 6 hours and 40 minutes of sustained combat before depleting.
A player wearing an Amulet of blood fury.