Ghoul Specific Mechanics
With your Ghoul being one of your highest sources of damage, and the primary tool which sets an Unholy DK apart from other DKs, there are some basic numbers to know about it.
Ghouls work like most permanent pets, receiving a portion of your stats and can be buffed by the raid.
In terms of Paladin blessings, your Ghoul will receive the same blessings that the rogues are given. If no rogue is present, your Ghoul will need blessings given individually.
Ghoul Strength (with talents + [DEPRECATED Glyph of the Ghoul]) = 331+1.52*Master'sStrength.
Ghouls receive 100% of your haste rating.
Ghouls have AoE mitigation, 45% for each point in NotD. This is both physical and magical damage reduction.
Ghoul hit rating rounds down. So if you have 7.99% hit rating, the ghoul will have 7% hit rating.
Ghouls gain expertise based on your hit rating. So if you had 131 hit (4%), the pet gains 13 expertise. 263 hit (8%), the pet gains 26 expertise. The Draenei hit aura does not give expertise to the pet.
Ghouls benefit from the 15% haste of Unholy Presence, but not the 15% damage of Blood Presence