Convince Artz to summon Parfinora. Introduce her to your champion. Invite her over. Upon seeing the painting, Parfinora will immediately slash it with her saber.
However, I'm afraid that the painting depicts something awful, which will cause the character who destroys it to suffer a negative consequence. This situation calls for a plot where Gillon sacrifices himself to save Beata, they cry and confess their love for each other, and then she grieves and chooses the path of redemption, but I don't want to eliminate my champion.
And yes, I see Bibu and Bobu as two full-fledged champions, specifically for such cases, so that if something goes wrong with one champion, there's a backup.
🏹🎪+⛓️♿=💕