Mistyra
A demonic woman capable of controlling meat parasites.
Events
Meeting her:
Can be done any time after reaching New Ark city.
Spoilers! Click to reveal:
-While having 8+ Senses stat, explore the Wilderness, until you find a suspicious clearing. Pass the stat check to unlock the Deserted Base.
-Mistyra can be found as a rare random encounter in the lower areas of the Deserted Base (the ones that are infected.)
-Remember you can press D to automatically trigger an encounter.
Getting revenge on her:
Can be done after completing the Science Lab Tower event, and only if you've been captured by her at least once.
Spoilers! Click to reveal:
-Obtain the ingredients for Parasite Sedater. Requires 3 Slime Residue, 2 Worm Tooth, 2 Chewy Vine, 1 Sparkling Extract.
-The Sparkling Extract can be found in the Forest Park cave. You'll need to know Electric Shock (the second magic spell taught to you by Rinny.)
-Once you have the Parasite Sedater, return to Deserted Base, and defeat Mistyra. Choose the new option.