I've had about 250+ Rounds on Viktor on 4 accounts.
D4 season 5.
I Enjoy the new Viktor, he feels just like he was during Hidden OP stage in early of Season 5 (pre-nerfs).
His Q feels so much stronger, Love it.
His E is capable of wave clearing at level 7, just like before :D
I rarely go Lichbane. It's a fun tool to use, but only if I am fed. If I fall behind, I want reliable sustain.
If you are new to Viktor, with slow reaction time, and unable to Q-kite skilled players, don't bother purchasing Lichbane, it will be difficult to pull off.
First thing you want to do is to change QWR to quickcast, E to regularcast to draw it yourself.
@ level 1 I start with Q for easy hard pokes, E level 2, W level 3, Max E, Max Q, Max W. (Maxing R is a given)
The way I build Vik is:
Initial buy:
+ 2
First buy (If Behind): +1
, +
(try to have 1-2 pots)
Firs buy (IF DOING WELL): Rush level 1
E upgrade for maximum wave clear/poke. (try to have 1-2 pots)
Priority build:
to maximize Viktor's late E proc and Ultimate slow +
+ level 2 Q upgrade.
Followed by common sense items:
- Vs AP:

- Vs AD:

to maximize burn/penetration with
's bonus.
ONLY IF FED or if you are Skilled enough. This is not something you can buy if you are not good enough.
With correct runes, you will easily hit 40% CDR just with
+
/
My end build looks like:

If Fed:

Items to Rush before
ONLY IF:
vs AP jungle + AP mid
vs Zed/Fizz or heavy AD comps