Empirer belong to the 1st
group. Empirer is a common french verb.
Empirer is conjugated the same way that verbs that end in : -er
Empirer is conjugated with the two auxiliaries être
Empirer verb is
direct transitive, intransitive.
French verb empirer can be conjugated in the reflexive form: S'empirer
verb is a direct transitive verb, so passive voice can be used.
Attention: passive voice can only be used when empirer verb is conjugated with auxiliary avoir.