Talk:Mantis/@comment-5291020-20151028003417/@comment-59.167.120.207-20151028084553

Oxium is easy to farm, do Corpus missions, kill Oxium ospreys. Argon crystals drop relatively regularly in the void, I usually get at least one per void level. Rare/reinforced containers are a bit trickier but if you use your codex scanner and scan all the regular containers then the rare/reinforced ones show up as orange so it's not too hard to find them if you're thorough about it.