User blog comment:CrimsonWarden/Time Stop and Time Stop Countermeasures/@comment-26952857-20160910005822/@comment-29248623-20160911021311

Anons keep mentioning the demon tree but they forget that unless monsters are specifically designed to have counter measures or such abilities they aren't specifically immune to time-magic. Resistance might be a factor that comes along with levels but we must also take into account that Players and Customized NPCs are often modeled to have a counter measure or two. It may be in the form of a skill, an ability or an item.