The Devil Gate trial caves are three optional sidequests. The Digging Champ dojo technique is required to open up all three of these areas. Upon first entering each of these underground arenas, Amaterasu must fight a Bandit Spider. This yields a chest with a Sun Fragment inside. If a certain story event has already been cleared, then a Devil Gate will appear upon the next visit.


Like the Devil Gates in other locations, entering the doorway will begin a battle. However, the enemies found in the Devil Gate trial caves can withstand and inflict more damage than their regular counterparts, and they also appear in much greater numbers than in regular Devil Gates or Demon Scrolls. Furthermore, the area will not be immediately cleared by a single battle; instead, each "trial" consists of ten successive gates, each with its own increasingly set of opponents. Although Amaterasu can rest inside the cave after each gate battle, all ten gates must be cleared in the same visit; if she returns to the surface and comes back again, the gate sequence will start all over again from the first one.

• Retain Godhood. Amaterasu cannot take damage if it is present, but also avoid attacks at all cost, only resorting to being hit in situations when otherwise is impossible.
  
• Use Veil of Mist. Slowing down time means more damage can be dealt, run around to a demon's weak spot, and avoid attacks. For tougher fights, use an Inkfinity Stone and use Veil of Mist non-stop.
  
• Bring many Vengeance Slips, and use them when Amaterasu's godhood runs low. The extra money will cover the cost, especially in the Kamui Devil Gate trial cave.
  
• Area-effect attacks, such as rosaries, exorcism slips or some of the secret Celestial Brush techniques can save time and increase the Yen bonus by damaging multiple enemies simultaneously.
  
• Equip the Wood Mat in-between battles and use it in order to recover Solar Energy without needing to use Holy Bones, in case of incurring damage. Yen will be depleted as she recovers energy, but it would not matter, because this cost is covered by the money obtained from the fights.
  
• Bring many Steel Fist Sake. The enemies in the Devil Gate trials have much more stamina than ordinary demons, and finishing them off as quickly as possible is imperative. Steel Fist Sake lasts as long as a Vengeance Slip, so if Amaterasu has both, use them both at once in fights to inflict huge amount of damage without fear of being hit.

On the way to the cave leading to the Guardian Sapling, there is a hard-dig spot in an alcove to the left, near some cows. After fighting all of the "forced" fights in this region, the Devil Gate trials will be open.






Additional reward: Golden Peach and Stray Bead #44

Located on the middle island of the three western ones. The Devil Gate trials open up after clearing Oni Island.






Additional reward: Golden Peach and Stray Bead #65

Found behind a frozen waterfall, destructible with Cherry Bomb, below the path to Wep'keer. The Devil Gate trials will be open after defeating Lechku & Nechku in the Wawku Shrine.






Additional reward: Golden Peach and Stray Bead #79