Rings of Power: How Did The Shard Of Mithril Heal The Lindon Leaf?

gamerant.com:

One of the biggest themes in all of Tolkien’s works is that of good and evil, light and dark, and the balance between them. When that balanced is tipped too far one way or another, there are always devastating consequences. This has been symbolized so far in the Rings of Power by the black poison that is currently choking out the life of the trees in the elven kingdom of Lindon.

These trees and their ailment are a visible representation of the growing danger of Sauron. His darkness is spreading across the lands of Middle Earth, snuffing out everything that stands in its way. But in the seventh episode of the series, the healing of the poisoned Lindon leaf in Khazad-Dum by Durin’s shard of Mithril represents a very real hope that there might be a way to fight back against Sauron’s malice.

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When Durin slides the precious ore across the table in anger, it comes to a stop right beside the dying leaf that Elrond brought earlier. The leaf serves as proof of the very real danger that the elves and their kingdom are facing. Before Disa and Durin’s eyes, the thick, tar-like substance that infects the veins across the venation patter of the leaf begins to retreat. It turns from a crunched, withered looking thing, back to its full golden health. The Mithril shard and its glittering light seem capable of drawing the darkness right out of the leaf and absorbing it, without being damaged or tarnished. And this healing of the leaf could also heal and protect the elves from their diminishing that is to come.

It all has to do with the hints about the origin of Mithril that were given a few episodes earlier. Gil-galad revealed to Elrond that the elves were seeking the precious ore because they