Legend of the Beautiful Maiden (King)

A spider demon protagonist once subdued three ruthless enchantresses using his supernatural silk and arts, only for a mysterious figure to seize them. That figure is the Saintess of the Tianshan Sect, whose virtuous reputation masks her true role as the antagonist, binding the enchantresses as permanent energy batteries to drain their vital power for her immortality elixir. The captives remain helpless and horrified, realizing the Saintess has likely repeated this predatory cycle many times before as she tightens their restraints and drains them in a cruel, ongoing process.