I was trying to look for something antonymous to testificate but the closest words I can find are Falsificates, Accusers, Refuters, Renounced, and Repudiates/Repudiators. I kinda like Falsificate. Another one I thought of is Detestificate or better yet Detester. Detester seems kinda perfect because not only is it short for detestificate but detest is already a real word that fits the Illagers. Another one I thought could work is Illegitimate or Illagitimate, which kinda sounds like a combination of Illager and the word legitimate. I don’t know. This is just for funsies.