Savathûn's Executioners

Savathûn's Executioners are Hive enemies in the Throne World that drop Qualichor. A Deepsight puzzle node can appear once per daily reset in Florescent Canal, Miasma or Quagmire, and leads to one of three spots where the player fights an Executioner.

Looting the Executioners' chests unlocks some Triumphs and rewards Qualichor, which is needed for the Memory Alembic quest from Fynch. The source describing this is from the Witch Queen era, so details may have changed since.