Warrior Phantom Dancer Passive
Warrior isn't as distinguished as any of the other jungle items and also feels a little bit on the weak side. Since most Warrior junglers are melee and have trouble sticking onto targets, a passive like that of Phantom dancer seems suitable to their gank heavy styles. It can also bring their chase potential more in line with Runic Echoes junglers.
Here's the change I'd make:
"When within 500 units of an enemy champion, gain 6 MS."
I first wanted to make it 10 MS but I'm not sure if it wouldn't be too much without nerfing other parts of it. Anyway, the right numbers are for the balance team to decide but I think the idea makes sense and would be generally desirable on every Warrior jungler. Kindred may abuse it a little so I guess they could make it 3 MS for ranged.