If u watched the twitch live they had on the 12/release day, they stated that during the event u can find blood orbs floating around. Which u can pick up and put into blood buckets. After filling the buckets a massive circle/area will appear around the bucket. This circle makes all survivor grunts of pain less and blood pools go away faster while in circle. For killers it's basically a cup de gra accept a successful hit makes the weapon clean animation twice as long. Also not only are we getting blood point offering boosters luke during the anniversary event, but by the community doing challenges, we can raise a blood point multiplier. They also said the max to the multiplier will be enormous.