To get deepsite resonance weapons, i just do it's seasonal event right?

[thorn hinge]

Yes that is one of the best / Guaranteed way of getting it. especially if you have upgraded the whole thing. Other than that, just keep doing the same activity again and again.

[wraith jetty]

Thanks mr fo shizzle my nizzle

[wraith jetty]

Actually, does that include past seasonal events too? Im still doing plunder but i have yet to get another deepsite resonance