On your shuttle, go to -381X, 129Y and you will find a new location
You need to have a title equipped that grants halved damage for damage over 1000, (One of the Paragon titles for Asbel);Do not attempt this sub-event without such a title! When you walk towards the wreckage, there will be an event followed by a fight. The enemy won't attack you, but when it dies it detonates, and does the amount of damage you have life, so if you don't have a title on one party member that decreases damage, you will not live. Curry and other food that resurrects you after you die will not save you.
After the fight, you will get the item, Proof of Another World&; You will also get an armour that only Sophie can use You can turn in the Proof of Another World at the Sable Isoley Inn