Talk:Omega Isotopes/@comment-205724-20141229031953

You can acquire these from any planet that has a Fomorian over it, this changes daily'ish. They can drop from any enemy, in any mission... but missiontypes with lots of enemies would be highly recommended. It seems like Nekros+Descrate does NOT yield isotopes (at least I've yet to obtain an isotope from a dessy).

Also, IF a fomorian is at Mercury; Isotopes can drop in Void & Derelicts. If you go to Mercury and read the description under it "The only remaininig Orokin Towers are hidden here blahblahblah". So it actually makes sense that this occurs when Mercury has a Fomorian & it may actually be intentional.