Guild Wars 2

Has anybody come across this and remember the area it drops? You can use to access your bank and storage anywhere,anytime and never runs out. I have had the single use ones. It even looks the same as the one access icon. You can’t buy one with gems at BT either.
This is an awesome drop—but it must be extremely rare.

It’s from the black lion chests, there’s also a permanent trader too.

Thanks for that!