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If you have a save of Dragon Age Origins on your hard drive with the Blood Dragon Armor unlocked, it automatically transfers to Dragon Age 2 as well.
Ser Isaac's Armor set
To unlock the armor set, you have to create an EA account first and then link it with your PSN ID. Rent Dead Space 2 if you don't have it, go the main menu and it should log you into your account. Once you have done that, start your Dragon Age 2 copy and the set will be unlocked. You can find it in your special delivery chest at your house.