Not easy to explain but I'll try It's the whole string of melody in Ravenskill, from 2:22 to 2:33; in the first half there's a counterpart to Gabriel's triad that goes D-B-F. Now compare that to "Don't hold your breath, the night's still young." Xander's lines are a little different and I see that as a variant of sorts.
Oh yeah, you have a point - in Daryus' case the notes would be E - C# - G, right? (albeit in a different order).
In Xander's case, they would be G - E - Bb, also in a different order: G (
what have you) - Bb (
done) - E (
you murderer).
OK, I'll call this 'Xander's triad' here.
Moment of Betrayal... well, it's in the same key, but not quite the same melody as far as I can tell. Managed to learn the intro section on piano (I know half the song, yay!) and I do find the note triad, just that it's either in the middle of the cycle or has an E thrown in between. Feel free to give me a time stamp if I'm missing something I also know the intro section backs the chorus as well.
During the first bar/chord, both the riff in "Ravenskill" (guitar) and "Moment" (piano/strings) start with E - F# - G - B (and then the other two notes are F# - G in different orders), so that's what makes them the same to my ears (well, besides the 'Gabriel triad' like you said). I'll call this 'Xander's intro' here.
Besides that, while checking out the songs once again, I just realized they share a chord progression:
- In "Ravenskill" (2:22 - 2:25):
-'Xander's intro': Em
-'Xander's triad': D + F - In "Moment" (0:49 - 0:54); also repeating throughout (verses, the beginning of guitar solo and of outro):
-Brace yourself my brother: Em
-I have breaking news: D + F
Regarding the 'Xander's triad' you mentioned: I don't know if it's looking way too much into it, but I think it also appears disguised in "Moment Of Betrayal", when the guitar plays this 5 note riff at the end of the intro (0:47), the first and last chorus (1:57 & 5:20), the outro (5:47), etc:
C - B -
F# - A -
D#If that last part was intended that way, then you would have all the elements of 'Xander's theme' - the intro, the chord progression, both triads - shared between both songs.