Golden Blood is a Blood Crucible passive skill. It has 5 tiers.
(4-20)% chance for transforming to add an Explicit Modifier to Magic or Rare Equipment
The maximum number of explicit modifiers: magic(2), rare(6).
As you slay The Scourge, the Blood Crucible gains experience. You can allocate its skill points in its own passive skill screen, which allows it to specialise in many aspects of transformation for better outcomes on your items.
Explicit modifiers
The number of affixes given by rarity depends on the rarity class:
Magic - random modifiers based on conditions: (0 to 1) prefix and (0 to 1) suffix
Rare - random modifiers based on conditions: (1 to 3) prefixes and (1 to 3) suffixes (but always at least 3) with the exception of jewels which can only have (1 to 2) prefixes and (1 to 2) suffixes
Unique - non-random, fixed modifiers based on the unique entity