League of Legends (LoL) Question: Best Keystone on Jungle Diana?

Dark Harvest is really good. She can farm super fast, and most importantly she can chain dashes so she procs it several times in a teamfight.

Phase Rush would be my second choice. She procs it instantly with Q-R-AA or Q-R-W.

Electrocute is pretty outdated now. It got specifically nerfed so that it's no longer viable on junglers. Now even early game Dark Harvest deals significantly more damage.

Fleet Footwork...no idea why you'd ever want to run that. 20% movement speed for 1 second is pretty terrible compared to Phase Rush, and Diana doesn't need sustain in the jungle, she has a shield (also Ravenous Hunter is way better if you want sustain anyways)

Typically you want to run Precision as secondary tree for Legend: Alacrity. Attack speed increases her clear by a lot.

You can also look at running Fleet Footwork for additional sustain in the jungle plus the attack speed increase from Legend: Alacrity. Or possibly go Phase Rush and Nimbus Cloak to help you stick to targets, but honestly Diana is trash tier in the jungle because her pre-6 ganks are dog doo-doo and she can't fight anyone before she gets Enchantment: Runic Echoes and probably a Hextech Rocketbelt or Stinger / Nashor's Tooth. And I say all this not to be mean, but as some one who has tried to use her out of the jungle (she is only the second champion I ever got a Pentakill on), but I arrived at the conclusion that she is only for funsies or a counterpick in Mid. If you want to play an AP Assassin out of the jungle look to Evelynn or Ekko.

I'm not a Diana player, but from what i know, Electrocute is still probably going to be a better option over Dark Harvest. Dark harvest is good on junglers that can just sit back and farm. From what I know, Diana is going to be super gank heavy when she hits 6, and will not have a ton of time to farm, since she's ganking all the time.

Hope this helps,

~moon