*puts fingers together* could you make a guardians of the covenant flag that fits with the armours of the imperium mod so I can put it on shoulders

Ooh, RIP Astral Knights. ;-;7 You will be remembered as an honorable and glorious chapter.

No problem mate, if I was wrong I'd probs work up the effort to get it changed, mad OCD when it comes to these things.
Thank you for the input regardless, hope u enjoy the mod for what it is. :)

Hmm actually it seems I'm the one who's mistaken. I could have sworn that the Astral Knights were white on black but I didn't notice that their left paldrons were black while the rest of the armour was white. Nevermind, my bad.

I'm not too familiar with the Astral Knights myself and was just requested this from a user. Was going by the wiki colour schemes and after the scouring the internet for a bit I've yet to find a black on white insignia. Could you link me a source otherwise I'll just leave it as is, not much time for flagmaking these days, appreciate the feedback though.

Pretty sure that's just an inverted Sable Swords Chapter insignia. The Sable Swords were founded to replace the Astral Knights after their destruction. The Astral Knights did have a similar banner though (you've got the swords facing up, which is right) but the colours should be reversed (black swords on white).