Ugh, I hate when it deletes my posts before I'm done.
Anyway...
Jungle Knifecat!
For runes, I'm not really sure what the best ones are because I mostly use the same generalized set on my junglers (since I don't want to spend a bunch of time grinding IP right now), but some of the more beneficial ideas I've seen are something like this:
Quints: 2 AD and 1 flat CDR, or 3 AD, MS, or CDR
Marks: 9 flat AD or AS
Seals: 9 flat armor
seals: 9 flat CDR or 9 scaling MR.
If you take the flat CDR glyphs, take the one CDR+2 AD quints for 10% starting CDR and take the 5% AS from masteries, if you take the flat CDR glyphs and 3 CDR quints, take 5% CDR from masteries to start the game with 20% CDR. Rengar loves CDR because he has no costs and spamming abilities gets his ferocity up faster. Getting to the 40% cap as soon as possible means more spell spam, lower Ult CD for more ganks, and better in fight DPS and utility (I read a guide on Rengar some time ago that detailed just how much Rengar gains, but all I can remember is it is a LOT).
I'm going to talk about a few builds from the perspective of the three different starts: 0% CDR start, 10% CDR start, and 20% CDR start. In general though, even if you want to play Rengar as a fighter rather than assassin, you NEED to have high early damage to be worth anything, so avoid 
. It does not synergize with his play style much if at all, so If you want a tank, play a real tank instead.
- just a heads up, whenever I mention
, it will be in reference to the soon to be released rework of that item, not its current form (because then my advice would be outdated really quickly).
0% CDR start (for the tankiest of Rengars):
Starting items: 
First back: 
Early core: 
/
/
(depending on enemy team comp) 
Offensive items: 
Defensive items: 
Example final build:
10% CDR start (can easily go either very tanky or full assassin):
Starting items:
First back:
Early core: / 
// (depending on how fed you are)
Offensive items: 
Defensive items:
Example final build:
20% CDR start (Balls to the wall assassin Rengar, can go a little tanky in a pinch):
Starting items:
First back:
Early core: /
Offensive items: 
Defensive items: 
Example final build:
Key things to remember with any of these starts:
- Always get Trailblazer and boots first back, unless you are ahead, then skip trailblazer for Skirmishers/Stalkers
- Always ward up, and don't bother switching to sweeper until level 9 since you gank with your ult.
- Be wary of the CDR cap; If you start with 20%, don't waste your gold on excessive amounts of it.
- Warrior is always the best jungle enchant on Rengar, it gives everything you need early (get it even if you are going tanky).
- Try to snowball an early lead with your high early damage.
- Remember to itemize for the match, if you start with a lot of damage but need to tank up for your team, do it.
- When playing assassin Rengar, don't be afraid to take the kills from your ganks so you can snowball everyone more easily.
I hope this was helpful!
) Jungle, and I've been having a couple of issues.
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