Enbarr
Appearance
Enbarr or Embarr (meaning "imagination") in Irish mythology is Niamh's horse. He can run across sea and land without touching the ground or water. This horse cannot be killed by man or god.
Enbarr is also the name of Manannán mac Lir's horse, the Celtic God fabled to live on the Isle of Man.<ref name="Manannan Mac Lir in Irish Mythology: Spaan, David B, http://www.jstor.org/stable/1258585?seq=2</ref>