Shin Malphur. He killed dredgen yor with the first golden gun. He then went undercover as dredgen vale in order to hunt down the other dredgens. He also go after guardians who are corrupted by the darkness (he understands elsies argument about stasis and accepts it, he just kills the ones who let the darkness corrupt their soul and behavior). This is unlike shayra who just kills for guardians welding stasis regardless of their soul.