Stygian Stones are summoning materials limited to chests in the late tiers of The Pit and World Bosses in World Tier Four. You've still got a long way to go before you can collect the quantities needed to summon the Tormented versions of Uber Bosses in Diablo 4 Season Four.
Diablo 4 – Where are the Stygian Stones..?
Kill a boss in The Pit or a World Boss in World Tier Four for a chance to receive a Stygian Stone in Diablo 4 Season Four. If you’re already close to The Pit tier 60, 70, or above, you’ll notice that even if you repeatedly complete these dungeons, you won’t always receive Stygian Stones. This is because they have a low drop rate and there’s no guarantee that you’ll get them from the bosses of these dungeons. The best way to increase your chances of getting Stygian Stones is to upgrade your gear via Tempering and Masterworking to take on even higher tiers of The Pit. Don’t forget to double-check whether you’re at World Tier Four as well, as this will increase your chances of spotting the item.
You can also keep an eye on the world boss timers to know when they will appear, as they can also be a source of Stygian Stones.
Once you’ve gotten your hands on at least two Stygian Stones, you can head to the Uber Boss dungeon you want to summon and use them. You’ll need different materials to summon their Tormented Echo version, which is level 200 and much stronger than their standard form. This is partly why these stones take so long to drop: if you could have gotten them earlier, you’d likely be wasting them because you wouldn’t be strong enough to kill the boss.
