Crystal Heart of Phandelver can be accessed from any of the three entrances. The first two are found by following the water passage that leads into the center chamber of the Crystal Caverns. The third entrance is by traveling under the floor of the Crystal Caverns. If you do not have this crystal heart yet, then the first two entrances will open up shortly after you enter the caverns. You must also get this crystal heart before you visit the Temple of Phandelver to complete the “Gauntlet.”
Once you reach the Temple of Phandelver, it’s time to turn on the light. To make things easier, the Temple of Phandelver is lit with torches. Use your light to light up all of the areas in the Temple of Phandelver. Take the three pillars from the left of the room and place them against the walls to form a triangle. Place a fire beneath each of the pillars. Light the torches and go around the Temple of Phandelver. If you haven’t gotten the Crystal Heart, it is located by the right wall of the temple.
When you enter the Temple of Phandelver, the crystal heart is found by the right side of the Temple of Phandelver. If you haven’t gotten the heart yet, it is located by the center of the temple. To get inside the Temple of Phandelver, you must first enter the Crystal Caverns. There are three entrances to the Crystal Caverns. The first entrance is found by following the water passage from the middle of the Crystal Caverns. The second entrance is found by traveling under the floor of the Crystal Caverns. The last entrance is found by traveling along the bridge that connects the Crystal Caverns to Phandelver.
When you reach the center chamber of the Crystal Caverns, use your light to light the three pillars in the center of the room and you will find a door to another chamber with another crystal heart. The next crystal heart is found on the third pillar after traveling through the doorway. The fourth crystal heart is located underneath the right side of the fourth pillar on the left of the room. Once you have all five crystal hearts, place them in the boxes located underneath the Temple of Phandelver.
Once you are done completing the Temple of Phandelver, return to where you found the Crystal Caverns. and the Temple of Phandelver crystal heart is located. Use your light to light up the three pillars in the center of the room and you will find another crystal heart. The fifth crystal heart is located on the other side of the center pillar of the room. Then, light the final pillar, and place the crystal heart inside of the box located on the far left of the room. The sixth crystal heart is located inside of the box on the far right side of the room.
The seventh crystal heart is located inside of the box on the left of the Temple of Phandelver. The eighth crystal heart is located on the right side of the room. The ninth crystal heart is located in the box in the back corner of the room. Then place the last crystal heart in the box to complete the “Gauntlet” by turning on the light. Then, place the temple map on your map and a portal to Phandelver opens. Use the portal to travel back to the entrance where you entered the Temple of Phandelver.