How do you get to this hidden coffer in uber lab?

Was running through the uber lab and found this hidden coffer. Its on the left side of the picture. Only thing I can think of would be to use leap slam or that lightning teleport skill but didnt have those on me.

I also explored the whole map for a passage around the other side but nothing there. The picture taken was after I explored the whole area.

https://imgur.com/a/tadQ7PZ

yep lightning warp, and theres nothing special about the chest, might get an alt or a chance from it, nothing special guaranteed