One of the most important things the game doesn’t tell you is how to get and restore mask energy in Soulmask. During your playthrough, you can often check the Mask Node Repair screen to see how much energy you have left. Letting it get to zero isn’t a good idea, so you’ll want to find ways to replenish it. Luckily, all you need is the right crystals. Below are the gems you’ll need and where to find them:

You must use Sunstone to restore your Mask's energy when it is almost over. According to the in-game description, Sunstone is "A high-energy storage unit left behind by an unknown civilization. Only restores 100 energy to the current Mask after use due to poor preservation." This stone or crystal is green in color and weighs 0.5 weight. Each stack of it can contain up to 100 Sunstones.

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You can get Sunstones from chests found in the Mysterious Ruins. It is not yet known if you can craft them, so exploring the ruins is your best bet for finding them. You can also get them from NPCs. If you have opened all the chests and found nothing, you can wait 10-20 minutes before checking the ruins again to see if new chests have spawned.