One of the spells would ne Nocturnes Ult. Definitely unique because he is the only one who can turn off the lights of enemies.
Graves can as well. o:
I'd say Poison Trail, since it's a unique spell, that also completely defines an extremely unique champions playstyle.
Lucian is the only champion that can attack while moving, in some sense.
Thresh's lantern obviously.....amazing def and off capabilities with amazing range
urgot can flip places with you...
All CertainlyT champions have unique spells.
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