The memoriam crystal s01 is found on Freneskae. It is one of four Seren Memoriam crystals needed to unlock the Crest of Seren cosmetic override.
I would do anything for my companion to prove my devotion, as he would to show his adoration. When we are apart, however, I am more coherent: can think and feel more clearly. He thinks this is some form of control forced upon us by Mah, so that we will always strive to remain close to each other and to her. I urge him to stay with us, but he intends to leave. He does not see - or does not care - that Mah acted not out of malice; only fear of being alone. Without her we would not exist. I owe it to her to stay, to sooth my creator. I cannot leave her alone... she needs me.