Blessed Knight Splinter
From Destinypedia, the Destiny wiki
These Knights behave like any ordinary Knight would; attack targets, shield themselves and recover when necessary, and charge a belligerent when at low health. However, the Knights also carry the Witch's Blessing, which makes them immune to anyone who doesn't carry the buff. To kill them, players must have the Witch's Blessing buff, so that they may damage them.
List of appearances