As verbs the difference between impierced and empierced
is that impierced is (impierce) while empierced is (empierce).
empierced
English
Verb
(head)
(empierce)
empierce
English
Verb
(empierc)
To pierce through.
*1590 , Edmund Spenser, The Faerie Queene , I.xi:
*:The weapon bright / Taking aduantage of his open iaw, / Ran through his mouth with so importune might, / That deepe emperst his darksome hollow maw [...].