Securing the three Rock Crystals in Clair Obscur: Expedition 33 is a pivotal early-game objective found within the Stone Wave Cliffs. This quest, initiated by a non-hostile Nevron named Hex Ga, rewards players with the Auto Shell Picto—a defensive tool that significantly alters the early combat dynamic. Understanding the precise navigation of the Tide Caverns and the long-term consequences of interacting with Hex Ga is essential for a perfected playthrough.

Meeting Hex Ga in Stone Wave Cliffs

The Stone Wave Cliffs serve as a major exploration hub in Act 1. As players progress toward finding Florrie, they encounter Hex Ga, a unique Nevron characterized by its non-aggressive stance and the prominent stalagmites on its back. This NPC is located on a cliff overlooking the Old Farm, adjacent to the Tide Caverns expedition flag.

Hex Ga requests three glistening Rock Crystals to restore its "glimmer." Unlike many other quest items that appear in the inventory automatically through story progression, these crystals must be manually harvested or won through combat within the nearby subterranean complex known as the Tide Caverns.

Navigating the Tide Caverns

The Tide Caverns are accessible directly behind Hex Ga's location. To begin the search, players must descend into the lower levels of the cave system. This involves utilizing a grappling hook to cross the initial gap and then taking a long rope or zipline down to the cavern floor. The environment is vertical and filled with hexagonal rock formations that can obscure the glowing crystals if one moves too quickly.

First Rock Crystal Location

Upon reaching the bottom of the Tide Caverns via the long rope, look immediately toward the left. The first Rock Crystal is contained within a bright, glowing blue mineral deposit.

  • Method: Use a field attack to strike the crystal structure.
  • Warning: Small groups of enemies often patrol this immediate area. While they are not elite-level threats, it is safer to clear them before attempting to harvest the item to avoid being interrupted during the pickup animation.

Second Rock Crystal Location

From the site of the first crystal, move toward the center of the cavern. There is a noticeable incline leading toward a raised platform or small hill.

  • Visual Cue: Look for a large hexagonal stalagmite that partially hides the area behind it.
  • Method: Circle around the rock formation to find the second blue glowing crystal. Perform another field attack to shatter it and collect the item. If stealth is preferred, players can often crouch-walk around the back of the hill to avoid the line of sight of larger Nevrons wandering the central pool.

Third Rock Crystal Location and the Rocher Fight

The final crystal is not a simple harvestable object but a drop from a specialized enemy encounter. Head toward the far right section of the Tide Caverns, near another rope that leads to an even deeper level.

  • The Ambush: As the party approaches the glowing blue crystal situated near the ledge, it will animate and reveal itself as a Rocher—a rock-encrusted Nevron.
  • Combat Strategy: The Rocher is highly resistant to Fire-based abilities. To end the fight quickly, utilize physical strikes from Gustave or Sciel’s precision attacks. Avoid wasting AP on fire spells. Once defeated, the Rocher drops the third and final Rock Crystal.

The Auto Shell Picto Reward

Returning all three crystals to Hex Ga completes the quest and triggers a unique interaction. The NPC will stand up, allowing players to collect the Auto Shell Picto from the crater where it was previously sitting.

Tactical Analysis of Auto Shell

The Auto Shell Picto is a high-value defensive asset, especially for characters with lower natural survivability like Maelle.

  • Effect: Automatically applies the "Shell" status to the equipped character for the first three turns of every battle.
  • Stat Boost: In the current version of the game, this typically grants a significant temporary HP buffer (often exceeding +400 HP) and reduces incoming physical damage.
  • Strategic Use: This is particularly effective during boss encounters in the Stone Wave Cliffs and the subsequent Forgotten Battlefield, where enemies often have high initiative and attempt to burst down the party in the opening turn.

To Kill or Spare Hex Ga: The Long-Term Choice

After receiving the reward, players are faced with a choice: leave Hex Ga in peace or initiate a combat encounter to harvest its materials. While the immediate rewards for defeating Hex Ga—such as Colour of Lumina and chroma catalysts—might seem tempting, the long-term cost is steep.

The Sparing Path (Recommended)

Clair Obscur: Expedition 33 rewards moral consistency. If players spare Hex Ga and all other non-hostile quest-giving Nevrons throughout the game, a massive reward awaits in Act 3.

Upon reaching the "Fountain" area near Spring Meadows, players will encounter an NPC named Blanche. If no friendly Nevrons have been harmed, Blanche bestows a massive cache of 100x Colour of Lumina. This is a critical resource for late-game equipment upgrades and far outweighs the meager drops gained from killing Hex Ga early on.

The Aggressive Path

If Hex Ga is killed, the player loses access to Blanche’s 100x Lumina reward. Instead, Blanche will become a hostile, high-level boss (approximately Level 80). While defeating Blanche provides a "Grandiose Chroma Catalyst," it is a significantly harder path that deprives the player of the easiest source of mass Lumina in the game.

Additional Secrets in Stone Wave Cliffs

While hunting for Rock Crystals, players should be aware of other valuable items in the vicinity to maximize their efficiency:

  1. Paint Cages: There are two paint cages in the Stone Wave Cliffs. One contains the "Delaram" weapon, and the other contains "Due Num." Both require finding and shooting three hidden locks in the surrounding environment.
  2. Jeri Jeri’s Shop: Located through a crawlspace near the Old Farm, this secret merchant sells the Ponytail haircut for Sciel and offers the Rangeson weapon if defeated in combat.
  3. Expedition Journals: Journals 78, 56, and 50 are scattered throughout the cliffs. These provide deep lore regarding the 78th Expedition and the nature of the Paintress, which adds context to why Hex Ga is different from other Nevrons.

Final Exploration Tips

When exploring the Tide Caverns for the crystals, ensure that Sciel is in the party. Her field abilities and range are helpful for spotting the glowing blue minerals from a distance. If a crystal stays in the inventory after the quest, this is a known behavior in the current build and does not negatively impact future quest lines. Some players have also reported that Rock Crystals continue to drop from enemies in the dark cave areas of the cliffs even after the quest is completed, making them a potential source of minor income or crafting filler in the late game.

Completing the Rock Crystal quest is more than a simple fetch mission; it is a test of exploration and a setup for one of the game's most significant late-game reward tiers. Prioritizing the Auto Shell Picto early will make the difficult boss fights of Act 1 considerably more manageable.