Graviton Spike is an Exotic hand cannon from The Edge of Fate expansion in Destiny 2, and it’s a craftable Exotic. This means you should prepare to run around Kepler for a little longer to hunt down all its upgrades and catalysts.
To get all the catalysts, you must complete the Graviton Through the Ages quest to get Graviton Spike, and get close to 200 Power to unlock Fabled and Mythic difficulties on Kepler. This is because Rapid Hit and Subsistence are available starting from Fabled difficulty, while Transcendent Zen and Temporal Alignment are only available on Mythic difficulty.
