Don't know about the lockpick, but you can use the silver crest in Melkor's Tomb to free Erza.
https://aurelia-game.fandom.com/wiki/Erza#Freeing_Erza
Don't know about the lockpick, but you can use the silver crest in Melkor's Tomb to free Erza.
https://aurelia-game.fandom.com/wiki/Erza#Freeing_Erza