Some abilities/mechanics I have yet to see and think would be cool

These are just a few ideas i have, i have not thought deeply about numbers or power balance. these are just some concepts that i think would make cool abilities and add some interesting gameplay.

1 - an ability that marks a champion with a debuff which when hit by another of this champions abilities or and ally's auto attack or ability, procs the mark for %health damage and a slow. The mark then jumps to a nearby enemy. The mark can jump a max of 2 times (slowing 3 enemies). If all 3 marks are procced, the 3 marked targets become snared/stunned.

2 - creating an aoe that damages enemies when they use abilities. maybe not an aoe, but maybe putting down a "tesla pillar" of sorts that can be auto attacked down but that shocks enemies when they use abilities in its range.

3 - some sort of incentive for a regular laner to buy sightstone. perhaps this champion can reflect their skillshots off of wards, and when reflected the skillshot does 2x dmg. or the champion can place wards and detonate them like mines. or maybe the champ can "draw energy" from the wards, creating a sort of damaging link between the two for a few seconds.

4 - a large cleave type ability that damages and displaces enemies by pushing them all into a line. or possibly two large waves crashing into each other if that helps with the image.

5 - puts a wall onto an enemy champion that follows them for a number of seconds. this would probably have to be similar to a karthus wall and not a physical barrier type wall.

6 - mark an enemy target (champion or minion) with a debuff that periodically damages enemy champions that get in close range.