Blood Boil + Supports

Blood Boil fits with Swift Affliction, can be supported by Brutality, but can not be supported by Intense Agony and Drain Ailments. Why? What, corrupted blood isn't ailment but also isn't debuff? Nowhere typed that corrupted blood damage is unscalable. In poe 1 you can use all gems for DoT for corrupting fever. I think that Swift Affliction here also do not scale damage, but reduces duration only.

Btw Swift Affliction do not increase Profane Ritual damage also.

Maybe it should be.

Anyway. There is Swift Affliction without spell type, but it do not affect Profane Ritual as DoT dealing skill only skill duration, and I suppose same with Blood Boil.