Incentive to Counter Jungle
A new jungle camp should be introduced with very unique mechanics to motivate junglers to invade the enemy. There will be an egg somewhere in the jungle that is only targetable by an enemy with smite, and if it is not killed before a certain time, a monster will spawn that is only targetable by an ally with smite, and gives an above decent, non-transferable buff.
It may sound strange, but I was inspired by the oddity that is the Rift Herald. It is a very specific monster that should only be prioritized at very specific times. There is strategy to taking any of the epic monsters. This will be in between those and regular monsters. I feel that this would add such interesting and strange tactics to protect the egg and to secure the buff.