Jungle Item Balance Idea
ISSUE: Champions are taking smite and jungle items without being the jungle and to me that is stupid. Itemization should favor jungle items being on junglers and these items should be weak on any other role by comparison.
ISSUE: Sated Devourer is a great item right now that is edging the tank jungler meta out and replacing it with an attack-speed jungler meta.
ISSUE: Runeglaive is not great on all AP junglers. It is strong on NIdalee and Ezreal but weak on FIddle.
If you look at the first two issues side-by-side and really think about it, the solution to both of them is clear. Why don't you see many people taking the most OP jungle item when they don't jungle? Because you have to farm jungle to make the item strong. How can we make it so Runeglaive is not as OP in lane? Make it so you have to farm jungle to make it strong.
On top of this I feel like cinderhulk and warrior need a little love to make these jungler types have a chance to shine. Some jungle tanks are still good but with devourer they get a little outclassed by the  ,  ,  , and  junglers.
My proposed item adjustments:
Devourer/Sated Devourer - Keep this one as is.
Runeglaive - I like what riot did with Runeglaive but I feel like it has two inherent flaws. One being what I mentioned above where champs like Ezreal are taking it to lane and being OP. The other is that certain AP junglers like Fiddlesticks don't utilize its passive very well. My suggestions is that you keep the spellblade passive but have it build stacks like with devourer and also have it behave a little different so champs who don't want a lich bane aren't screwed so hard.
Spellblade - After using an ability, your next basic attack will deal additional magic damage equal to 100% base AD + (X% of AP) to your target and up to 3 additional nearby targets (prioritizes monsters if the intitial target is a monster, prioritizes champions if the initial target is a champion) where X is equal to the stacks you have on this item. (1.5-second cooldown). Versus monsters, this effect restores 7% mana plus 1% for each additional target hit beyond the first. Max 30 stacks. The sated effect would let your abilities to also apply the effect but have a 6 second cooldown.
^ This means Fiddle could farm jungle and occasionally throw out an AA once in a while but if he had a sated runeglaive he could ult a teamfight with a strong initial burst as well. I think this could make runeglaive on par with devourer on terms of scale as well as help out AP junglers who don't normally prefer a .
Cinderhulk - Change two things here. The % bonus HP should be (5 + X)% bonus HP where X is the number of stacks you have with this item. The Immolate passive would be that it deals 15 + (X) magic damage to nearby enemies, 100% bonus damage versus monsters. Max 20 stacks and then becomes a Sated Cinderhulk. Sated Cinderhulk would give you +X armor and magic resist.
Warrior - Bring back the Incinerate passive from Spirit of the Elder Lizard. UNIQUE - INCINERATE: Deals an additional 20 + (X) bonus true damage over 3 seconds upon dealing physical damage where X is the number of stacks you have with this item. Max 20 stacks and then becomes Sated Warrior. Sated Warrior would also apply a X% slow for 1 second when Incinerate is applied.
I think this would allow all manners of junglers the opportunity to shine with their jungle item and open up a wider variety of strong jungle picks.
could apply lizard elder's true dmg on his ad spells. They were not forced to get smite to equip a jungle item either. you would think they would have been more common in lane then. But at 2000 gold they were a bit underwhelming stat wise compared to alternatives.
Back then you could still see someone like shaco not even bother getting machete and start doran blade and rush hydra to clear faster. (this made his early ganks really strong, hence the changes to the jungle being near impossible to clear without machete early game and the desire to force champions to get smite to buy machete)
for example would just sell a mini magus instead of upgrading it into runeglaive and use an item that suits him.