The Synthesiser could be found in the Memory Nexus. To use the Synthesiser, players had to place three Rare fractured items of the same item class. The size of the item did not matter, but the item class had to match. For example, one-handed maces and sceptres were considered two different item classes.
For details on the synthesising process, see synthesised item.
Fate of the game mechanics
After the Synthesis leagues ended, most of its content was not added to the core game. As a result the Synthesiser and the Memory Nexus was made unavailable. Fractured and Synthesized items will not be added until 3.11 Harvest league, only through harvest crafting on pre-made bases. As well as random drops in side of Heist Contracts and Blueprints in 3.12 Heist league.