As you know certain Grandmaster Nightfalls allow you to travel to the Open World (Arms Dealer f.e.) or even start there (Insight Terminus, Fallen S.A.B.E.R., f.e.) and grind easy kills from the normal enemies there. Normally this is not a problem (and quite useless, there are no extra loot drop modifiers, etc., but it makes it extra easy to farm Guardian Games Platinum Cards, or at least I find it easy ^^"), but if one runs one with the Arach-NO! Modifier active (Fallen S.A.B.E.R. f.e.) the mines drop for EVERY Player. I am quite sure I suprised some low level players with that. Luckily the mines drop only from the kills of the Fireteam that runs the GMNF. Not a biggie, but I gather I write about it, since I didn't find any mention of it with the help of the search function. Also, sorry again for every Player I supprised with that, I tried not to kill too many Fallen Vandals near Players after I saw that happen in the open world ^^" Edit: That actually goes for all Nightfalls of course, I just tackled a lot of GMs the last weeks for training and finally finishing one hopefully in the next few days ^^"