What does the Old Crest do in Enter The Gungeon?
The Old Crest is a special passive item that can only be found in a special room in the Oubliette.
Old Crest will grant +1 armor upon pickup which will disappear as soon as you take any damage in the Gungeon. The Old Crest is not your ordinary passive item – it is necessary for unlocking the secret chamber known as the Abbey of the True Gun.
The bonus piece of armor that the Old Crest provides is mediocre at best, but the Old Crest does not exist to provide powerful passive effects anyway.
You need the Old Crest to unlock the Abbey of the True Gun, a secret room in Enter the Gungeon.
The Old Crest does not feature any Synergies in Enter the Gungeon.
Upon pickup, the Old Crest will give you a piece of armor instantly, but this piece of armor will override any existing armor that you have equipped. This means that the Old Crest will function as your primary armor as soon as you pick it up, making the Old Crest very vulnerable to incoming fire.
If you want to unlock the Abbey of the True Gun, you need to avoid taking damage as best you can as soon as you pick up the Old Crest. You can unlock the Abbey of the True Gun as soon as you place the Old Crest in the altar in the Gungeon proper.
You can protect the Old Crest if you have a Full Metal Jacket since the Full Metal Jacket will automatically trigger one of your Blanks before you take damage in the Gungeon.
The Old Crest cannot be dropped and it cannot be stolen by the Resourceful Rat.
You can use the Old Crest as a normal shield item that blocks a single instance of incoming damage in the Gungeon. Alternatively, you can do your best to avoid taking damage and bring the Old Crest to the altar in the Gungeon Proper to unlock the Abbey of the True Gun.