Wits end on varus?

Meh..I prefer the ArPen Poke Varus, try it on instead.

Great decision for early game, terrible decision for late-game.

Wit's End is more of a fighter item where you don't care that the flat damage doesn't synergzie with other damage items like Lich Bane or Infinity Edge because you're going to build straight tank afterwards and do twice as much damage by living long enough to do twice as much damage. Wit's End is also solid on fighters because it's pretty cost-effective early to offset it's lack of synergy with late-game (damage) builds.

If you feel like you're going to wreck face in the first 10~15 minutes of the game with it, go wild.

Varus I feel is pretty good with the armour pen. I'm actually been working on my build with him lately. A lot of viable items.

AP/AS/on-hit Varus is kinda a thing. I see it more on ARAMs or mid on SR than bot lane. It's not great really late.

itd be better on kog

I was actually thinking that as well... get those 3 stacks of blight to add the additional magic damage on hit and then even more magic damage on hit from wit's end. I hope a pro player can comment on it or make a video of how well it works lol or even try it ign for me to watch