Destroy the dark eco crystals was a mission in The Precursor Legacy that Jak and Daxter completed to obtain a power cell. According to Samos Hagai, the lurkers were after the dark eco crystals in Spider Cave. Jak later destroyed them all in this mission. The PlayStation 3 and Vita versions of this mission are related to a trophy named "Kerblamm!". Completing this mission will reward you with a silver trophy.