User blog comment:Valeth/Avenger of ???/@comment-38196594-20190717031241/@comment-27971189-20190717061612

Nero's Migraine have effect of reducing her skill success rate by interrupting head like you thought (still lose to her plot armor being protag Servant though, LOL).

As I wanted him to have skill that reduced his effectiveness, also related to head if possible, Migraine seems good.

His kit is inspired by Schez being 'defensive' and centered on her, so I think I could made one that closer to support and offense-oriented under limitation of 3* + Avenger neutral and low HP.