Cool. I suspected there was something to it since I so easily found not 1 but 2 RoRGs the first try after months of searching in vain.
Obviously opening a bunch of caches simultaneously is enough to trigger the counter. The more caches, the better. I'd say going for 10 would be almost a sure thing for getting a legendary. Thing is, that doesn't mean it will be the RoRG. There are 4 other Act1 only legendaries, so best case you have a 1/5 chance of it dropping. I got luuuuucky.
And just to reiterate if it isn't clear, Act1 caches are the only way to get a RoRG. It does not randomly drop. It's best to do the bounties on the highest difficulty that you can quickly go through. That's T3 for me, but going to T2 might be worth it since I can clear them even faster and the leg drop chance doesn't go down that much.
Obviously opening a bunch of caches simultaneously is enough to trigger the counter. The more caches, the better. I'd say going for 10 would be almost a sure thing for getting a legendary. Thing is, that doesn't mean it will be the RoRG. There are 4 other Act1 only legendaries, so best case you have a 1/5 chance of it dropping. I got luuuuucky.
And just to reiterate if it isn't clear, Act1 caches are the only way to get a RoRG. It does not randomly drop. It's best to do the bounties on the highest difficulty that you can quickly go through. That's T3 for me, but going to T2 might be worth it since I can clear them even faster and the leg drop chance doesn't go down that much.