Summoning the Grigoire boss in Diablo 4 is a surprisingly time-consuming endeavour, as you fight your way through Helltides to collect the special Living Steel material required to challenge him. The Galvanic Saint is one of the four bosses that was added in the Season of Blood as a way to target farm unique items, but gathering what you need to fight them is a task in itself.
While you can fight Grigoire on either Nightmare or Torment world tier, he'll only drop Shards of Agony—one of the materials required to summon the endgame Duriel boss—in the latter. With this in mind, it might be in your best interest to wait until you reach Torment world tier to fight Grigoire, just so you're maximising your rewards for time spent. Whatever you choose, here's how to get Living Steel and summon the Grigoire boss in Diablo 4.
