Empirer belong to the 1
st 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 and
avoir.
Empirer verb is
direct transitive, intransitive.
French verb empirer can be conjugated in the reflexive form:
S'empirer
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.