Lost Memory Synthesizers are prime collectibles in Xenoblade Chronicles X. They can be found in Oblivia, in particular near FN Site 320.
Trivia
- This item's appearance resembles the furnace required for Gem Crafting from Xenoblade Chronicles. In this case, the "crystals" mentioned in the description would most likely refer to Ether Crystals and Gems from Xenoblade Chronicles, which do not appear in Xenoblade Chronicles X.