Diablo Immortal: Lost Runes – solving the two puzzles

When searching for lost knowledge in Zoltun Kulle’s archives, you must, among other things, reactivate a core using three runes in order to progress further. Part of this reactivation process is in the quest Lost Runes to retrieve those runes hidden within the walls of the library.
Diablo Immortal: In the ‘Lost Runes’ quest you must reactivate the three runes on the core
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Many players are initially at a loss for the Lost Runes quest, which asks them to solve a 9-lamp puzzle and a mirror puzzle. Unlike many other tasks in Diablo Immortal, this one requires you to use your heads instead of your hands, and this can prove tricky once you get a little too used to the latter. But don’t worry, because below you will find all the answers to solve the two riddles!
The First Rune: The 9 Lamp Puzzle
The first lost rune is hidden behind a 9 lamp puzzle that requires players to light all nine torches at once. The difficulty is that when a flame is ignited, the torches go out in all four directions, which in turn not only ignite other torches, but also extinguish existing flames. Here’s the resolution.
Diablo Immortal: The description of the task for the 1st rune
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Diablo Immortal: If you misclick, you can delete the torches by clicking the rune socket again
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Diablo Immortal: The torches are to be clicked in the order given on the picture
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To solve the ‘Lost Runes’ 9 lamp puzzle, all you have to do is interact with all the corner lamps one at a time so that they light up at the same time. Some of the side and interior lights will flicker as you do so, but once you’ve lit the torches in all four corners, they should be the only ones burning. Then all you have to do is activate the middle one to complete the puzzle, because it sends flames to the remaining unlit torches.
The second rune: Grimaldi, the flaming soul
The second lost rune is from the mini boss Grimaldi, the flaming soul guarded. Kill him and then click on the rune.
Diablo Immortal: For the 2nd rune you only have to kill the mini-boss Grimaldi, the flaming soul
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The Third Rune: The Mirror Puzzle
The third rune reverts to the puzzle style of the first after the combat interlude. For this puzzle you will need to use mirrors to reflect the beam of light to where the rune is anchored. This is a slightly more complicated puzzle than the first and requires a few more steps. Here’s the resolution.
Diablo Immortal: After touching the 3rd rune, the mirrors and the beam of light are activated
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Diablo Immortal: In the first step you move the first mirror one place to the left
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Diablo Immortal: Then move the mirror next to the one you just moved down one space so that it’s to the left of the first one
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Diablo Immortal: Then go to the mirror next to the two on the far right and move it two places down (number 3 + 4 on this and the next picture) so that it clears the way for the light beam on the rune
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Diablo Immortal: The last step
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Diablo Immortal: Finally, you pick up the illuminated rune
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Diablo Immortal: Once the three runes have been used, the core is active and the way is clear for the following quests
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This should complete the Lost Runes mirror puzzle, and now all you have to do is go to the rune mark and pick up the quest item. After that, go back to the core and use the rune in the last socket to activate the core and continue the questline — (source).