Collecting all their Ultimate weapons will give you the last memory cg. Once you've collected them go back to the snow village.
hi again^^ i tried finding them and got the 2 problems on my hand if you wouldnt mind answering^^: !, what is the MCs ultimate weapon and 2 where do i get the dark matter drops? i tried farming them at fortess soul and it didnt work out...
MC weapon is at Arcius Ruins. Dark Matter is from doing the quest from the messenger at Regull Port.