what's an instance where you would play a phrygian triad(1 b2 5) or a lydian triad (1 #4 5) have you run into these kind of chords before and if so do you even call them that?
those are good for a very tense, sort of "oh no" situation. i wouldn't call them what you call them, but they are both kind of the same thing. 2 neighboring half steps, with another note a tri-tone away from one of them