Reproduction Steps: 1. Deploy any champion with weaken spells. 2. Deploy any champion on enemy team. 3. Cast Righteous Deflection with it. 4. Hit a deflecting champion with a ranged champion within the range of weaken spells. 5. The damage will be reduced by 5. This seems to be weird as IS faction bonus doesn't affect it. Proof: @Sokolov Is this WAI?
IS faction bonus definitely does affect it. I play as IS all the time and I've witnessed Righteous Deflection damage being 6 less when my champions are damaged by it. I believe it's WAI. Righteous Deflection is a spell, so it makes sense that damage from it is spell damage.