As you progress in the story, you can purchase ability upgrades that make picking locks much easier to accomplish. (shortpause.com)
That's why enemy encounters are quite frustrating even though with a few ability upgrades you can ease the fight against them. (squareportal.net)
That's right, not only does Dungeon Defenders 2 have tower defense elements, it has role playing elements as well, such as a classic loot - drop system and weapon / ability upgrade system. (thatvideogameblog.com)