As Vayne Jungle the scariest part is the first clear. Start at Krugs with help from your top/bot lane. Smite the big Krug last and finish off the small one. This helps save some hp because the little krug will get you to 4 or 5 hits toward the stun proc. Use a health pot if needed. Go to red and ward in case of an invade. Kiting as much damage as possible, use tumble and krug buff stuns to kill red. Again use your last health pot if needed. Go to the Razorbeak camp and keep on the edge of their reset area. Kill each of the small birds one at a time with 3 hits, then kill the main razorbeak. Lastly, either back now for your skirmisher's sabre or take the scuttle crab. (Scuttle can be condemned into the wall for the armor/mr debuff)

From the fountain go to Gromp and smite it for it's buff. Follow it by Blue/Wolves/Scuttle.

Using condemn on camps helps save hp massively by stunning and kiting them.

As a Devourer Jungle your early game is somewhat lacking, and unless ganks are guaranteed; they usually aren't worth it. Vayne's early ganks are somewhat lacking but can be insanely good if the enemy is extremely pushed up or can be condemned into a nearby wall.

As with anyone running devourer; I would prioritize things like the Dragon/Scuttle crab over ganks. Unless the enemy forces you to fight for dragon; you should wait until you get your devourer and go straight for dragon if the chance shows.

Now I don't particularly want to say who you will be good or bad against because late game you can melt anyone, but the most obvious way to put it is that you are still a squishy ADC, and anyone with CC has the potential to destroy you.

This is my first guide. As you can tell it isn't too descriptive (more of a here are the items go for it guide), but I have had a ton of insane games lately with Sated junglers and Vayne is by far my favorite. This is the first time I've ever played her and even I can pull off some insane scores.

I will also look to put far more effort into this guide at a later date.

Thanks!