"The storage chest is magically sealed, you are the only one who can open it"
Storage Chest helps you storing your items, so you don't have to carry everything in your inventory at all times. Although, it is only reachable from the Blacksmith and his brother's level so be careful what you store in it, as it is not in immediable reach (so it would be wise to not store keys in it which you needs while doing the dungeons, for example).
On default, you have 25 spaces in your Storage Chest. You can get +3 spaces in two missions (Need more space; Space is never enough). But if you still have the need to have more spaces, you can buy +10 spaces for 150 gems in the gemstore.
It can be autosorted by