Chapter 17 The Test Of The Eight I NEED HELP UNABLE TO OPEN CHEST

[Toiyopk]

okay so like Im here playing Blade and Souls right? so yes I am and while I am doing the Test of The Eight I run into an problem. The problem is im unable to finish the quest. I cant even open the chest in the last stage. any suggestions?

[Els]

Do you have some keys in your inventory ? Those chests requires 1 key to be opened.
Also, can you write the objective of the quest ? Or provide a screenshot with the quest objective and the area where you have to do it. It's quite hard to remember a quest by its name only.