Get Heart of Mar in weapons lab was a mission in Jak II. Ashelin Praxis gave Jak the information that Baron Praxis was meeting Krew at the weapons factory. Jak headed over there in an attempt to retrieve the Precursor Stone and stop the Baron from cracking it open. The PlayStation 3 and Vita versions of this mission are related to a trophy named "I Heart Heart", completing this mission will reward you with a bronze trophy.