[Man0warr]

Not sure about Werewolf/Boon, but Alliance/Benevolence works by raising your faction by 100/200 points.

So some zones where enemies con Threateningly (like Siren's Grotto) you can cast Benevolence on one of those enemies to raise your faction into Dubious level and all enemies on the same faction in the zone will also be dubious - no need to cast it on every mob.

For Siren's Grotto just be sure you didn't cast it on one of the animals that are always indifferent. Also, if you kill a mob or two or accidentally get faction hit in Siren's Grotto then Benevolence won't be enough to get you to Dubious and you can't raise that faction ever again.