History of Witch

Witch is not a standalone enemy type in Destiny 2. The Hive caste is called a Wizard; "Witch" appears only in the names of a few Wizard variants and as a title.

Usage

• Siphon Witches: female Hive Wizards of the Hidden Swarm seen draining the Light from a Shard of the Traveler in the mission Chamber of Night. Destinypedia notes they are the only Wizards named after their gender, and that they first appeared in the original Destiny.
• Ritual Witches: the two Wizards of the Witches Ritual public event, which a fan guide places on Titan. The Wizards try to open a portal, with Thralls, Acolytes and Knights as support; on the Heroic version destroying two crystals spawns an Abyssal Champion.
• Savathûn, the Witch Queen, holds the title as a name rather than as an enemy type; her Lucent Brood are covered separately.

Not found

No enemy called a Hive Witch in Ghosts of the Deep or the Witch Queen campaign turned up in the sources checked; those use Wizards and Lightbearer Wizards instead. See Wizard and Lightbearer.

Notes

The Siphon Witch and Ritual Witch variant names come from Destinypedia's Wizard and Hive Wizard pages (as variant names) and the Witches Ritual guide; Destinypedia does not treat Witch as an alternate name for the whole Wizard caste.