create implication arachne -> monster_girl
It seems insect girl and spider girl are tags too broad to justify an implication to monster_girl, as seen in the past discussions under the "insect_girl" forum search. However, an arachne is always a woman with monstrous body parts. If lamia, mermaid and harpy implicate monster_girl, there's no reason why this fourth monster girl type of greek origin (like the other three) does not.
The tag implication arachne -> monster_girl has been approved.
Updated by DanbooruBot