The new Darkin Assassin champion was hinted about on August 12 from the official league's youtube channel.

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League felt the need of some darkin, and community loved darkin champion, So the upcoming champ will be a darkin assassin.

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The weapons of darkins are very special some are bound by their weapons some are trapped in it or have curse on it.

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The New darkin assassin name or  it's wielder image was not released but this glimpse of the weapon was presented to the lol comunity.

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Darkin champions are rare in league of legend's champion roaster. Currently we have only three of them.

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AATROX (ex good human)

The weapon Aatrox holds has his true form essence in it. The body is just made up of stolen flesh from the people who tried to get a hold of the weapon.

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Kayne

Basically, a guy with the sentient dark weapon Rhaast, unafraid by its creeping corruption of his body and mind. Kayne and Rhaast try to control each other.

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Varus

The varus you see is recreated flesh of two Ionian hunters—they had mistakenly unleashed him, doomed to bear the bow containing his trapped essence

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darkins were trapped in a weapon. When someone came close to getting a hold of these weapons, they were used as the flesh to create a body that the weapon's essence could control.

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Kayn is an unique individual. His body is his own, although it is sometimes governed by Rhaast. Abilities  have different impacts in battle depending on who is in the charge.

Credit: Riot games