Don't nerf the item, Nerf the Champion.

Tho more likely, were going to have to nerf both. Sated Devourer is Obviously strong, Though I wouldn't say Broken, Just overTuned. But it does break a select number of Champions. Notably, Yi, Shyvanna, possibly Jax as well. That said, Their is good reason to nerf these champions, and not just Devourer. And here's why.

Sated Devourer was made to help Auto Attack based Junglers, who like to Farm and scale late into the game. Helping champions like Aatrox, Noctern, Xin Zhao, as well as the once already mentioned. And it does exactly that. But Yi, Shyvana, etc, use Devourer way more effectively than their counterparts. And heres the rub. Even if we nerf Devourer, (say, nerf it's on hit damage) Yi, Shyv, etc, Will still use Devourer more effectively than Aatrox, nocter, etc.

Bottom line, Devourer might need a nerf, But Yi, Shyvana, broken champ here, won't be escaping nerfs, as they need to be balanced around the new item.

On a side note, Devourer's Synergy with BotRK, is probably a trickier thing to tackle. I'm a little hesitent to call for nerfs on it, unless it was problematic elsewhere. That said, I would like to point out that it's 8% Current Health damage means it deals 80 damage on hit, (which applies life steal) against enemies with 1000 health. That's more damage than Any other On hit effect item. (except maybe nashor's tooth since that scales with AP) Still, it was made to be the tank Destroying item, so it's difficult to say whether it should be Nerfed/changed or not.