Rex Tremendae (English: Tremendous King) is the Latin song that plays during the intro cutscene of Megalith, the final mission in Ace Combat 04: Shattered Skies. It is also considered as a musical prologue to Megalith -Agnus Dei-, which plays during the first part of the same mission directly afterward. Rex Tremendae is featured as track 12 of Disc 2 of the Ace Combat 04: Shattered Skies Original Soundtrack, and was composed and arranged by Keiki Kobayashi. The lyrics were performed by the Namco Hometek Choir.



Rex tremendae majestatis,
qui salvandos savas gratis,
salve me, fons pietatis.

English translation

King of tremendous majesty,
who freely saves those worthy ones,
save me, source of mercy.


  • The lyrics are taken from eighth stanza of the Dies irae, a Latin hymn known for being used in the Requiem (Funeral Mass).
    • "Requiem" is also used as the name for the track that plays when the player fails a mission in Ace Combat 04, either by crashing or not completing an objective.
  • Rex Tremendae was used in Teaser 01 of Ace Combat Infinity.