Épier belong to the 1st
group. Épier is a common french verb.
Épier is conjugated the same way that verbs that end in : -ier
Épier is conjugated with auxiliary avoir
Épier verb is
direct transitive, intransitive.
French verb épier can be conjugated in the reflexive form: S'épier
verb is a direct transitive verb, so passive voice can be used.