Defeated the Spiderclan Queen Mother is a collection, that takes place within the
Witches of Dathomir Theme Park on
Dathomir.
You can start and complete this collection by completing the
The Hunting Party quest, which is part of the Spiderclan Queen Mother storyline which is started by
Spell Weaver Leandra for the
Nightsisters or by Arch Witch Azzenaj for the
Singing Mountain Clan.
You will most likely need a group to complete this quest, as it is group content.
Reward: XP and the Spiderclan Regicide badge