Olympus
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Consumables

Styx tonic(4)

Black water from the river of oaths. 4 doses left.

Dropped by

MonsterCombatWhereQuantityRarity
Hades, Lord of the Dead1000Bosses of the Underworld1–21/4
Cerberus, Warden of the Gate900Bosses of the Underworld1–21/4
the Soul-Eater560Bosses of the Underworld11/10
Thanatos, the Gentle Death520Bosses of the Underworld11/10
Alecto, the Unresting480Bosses of the Underworld11/10
Megaera, the Grudging480Bosses of the Underworld11/10

Rarities are base rates. Your drop rate bonus improves most of them - see the drop-rate guide.

Found in

BoxAmountChance
Tribunal Reliquary11 in 100
Ashen Cache11 in 200
Stygian Coffer11 in 200

In the guides