Question about Vampiric Brew and Sanguine Mastery

[SlothPaladin]

Vampiric Brew says: A brew that increases Spell Leech by 10% and Blood Type Efficiency by 5%

What is 'Blood type Efficiency'? Does this mean if you have a 10% chance to crit that turns into 15%?

Also on Sanguine Mastery says: Boosts the effect of your current blood type by 8%.

This is different wording then the brew, but what does it do, it seems unlikely that it is a boost of the quality of the blood, so does it change the effects? Does it add 8% or multiply the effect by 1.08?

When I use a Vampiric brew I can't figure out what it is doing apart from spell leach, I've tried drinking different qualities of blood but I don't see stat changes. I haven't gotten Sanguine Mastery as I don't like to spend my resources on something that has an effect I am unclear on.

I have tried using both Google and Brave search as well as looking at the wikis but they only state the effect not what the effects do. The articles all just seem to be AI generated boiler plate things explaining the basics of the different blood types and just listing the same states you can see in game without talking about the way other modifiers can effect your blood power.

[Hoshikudaki]

Sanguine Mastery would work similar to the 100% blood effect.
Eg Creature with IV blood increases health regeneration by 100%,drinking the brew would make it 108% regen.

Not sure on the vampire brew since it uses efficiency, I would usually associate that with blood draining rate. But then you have the blood key which mentions "-25% Reduced Blood Drain Rate"

Other people have done a few few tests
https://imgur.com/a/vampiric-brew-not-working-76DyMYN
Seems like no effect on atk dmg with Warrior blood bonuses

https://imgur.com/a/vampiric-brew-difference-sejgwXg
Increased resistances by 1 point

[SlothPaladin]

Thanks sometimes the descriptions are a bit vague and I guess I overlooked those very minor stat changes on the brew.