Tartarus is the deepest and final layer of the Underworld route — the ancient prison of the Titans and the seat of Chronos's power in Hades 2. The environment is oppressive and time-warped, with visual distortions reflecting Chronos's dominion over time.

This layer features the game's most dangerous enemies, including time-manipulating elites that can reverse or accelerate their own attack patterns.

Chronos, the King of Titans, is the final boss of the Underworld route and one of the most mechanically complex encounters in the game. His attacks incorporate time manipulation — pausing, reversing, and accelerating attacks and projectiles. The battle occurs across multiple phases with increasing aggression.

• Obsidian (rare, high-tier material)
• Zodiac Sand (used in late-game Incantations and Arcana awakening)
• Shadow Crystals (found in quantity here)
• Mandrake seeds (late-game resource)

Survivability and sustained damage output are both critical against Chronos. His time-manipulation attacks require patience and observation — rushing attacks during unclear windows leads to heavy punishments. Strong boons from Zeus, Hera, or Hephaestus synergize well with the lengthy encounter.