Darkin feels super isolated in the story and aren't interesting.
With "Varus" being the third Darkin now, there is a problem I am noticing. We have Aatrox, who wants to "kill the humans and reunite the Darkin", Rhaast who "wants to kill everyone and reunite the Darkin." And NewVarus who "Wants to kill humans sadistically and reunite the Darkin." None of these characters are likable or interesting at all. They only exist to want to kill people and find each other too...kill everyone some more?
They just aren't an interesting faction or contribute anything to the meta plot of League's world. They are so old that hardly anyone knows they exist, they only care about each other and no one outside of that save whom they may posses and their motives are as generic as they come. I don't understand why they are being pushed and developed when there are always so many antagonistic forces in this universe that sound much more interesting than them. I would of much rather they just retcon Aatrox to be a demon like Eve or Tahm and just scrap the concept instead of trying to make these boring characters.
EDIT: Just so people are aware, Aatrox's lore has been changed to this
One of the ancient darkin, Aatrox was once a peerless swordmaster who reveled in the bloody chaos of the battlefield. Trapped within his own blade by the magic of his foes, he waited out the millennia for a suitable host to wield him - this mortal warrior was corrupted and transformed by the living weapon, and Aatrox was reborn. Though tales of the darkin have now passed into legend, he remembers only too well the destruction of his race, and wreaks his vengeance one sword blow at a time.
Which is somehow even more generic and cliched as his older one.