An interesting solution for turret that bring new game play
I had this idea for a way to buff turrets with out giving them flat increase in damage but also creating a new objective in the game to fight for. The idea i have is to add two Power obelisk in both team jungle that grant turrets special features when up.
Power obelisk of Speed
This power obelisk grant all turret bonus 20% attack speed when up. It is guarded by a minion that you can kill for 50 gold. If your able to destroy the Obelisk you gain 55 gold also an attack speed buff that last 5min.
Power obelisk of Intensity
This power obelisk grant all turret bonus armor/mage pen also make ever 4 turret attack deal bonus magic damage. It is guarded by a minion that you can kill for 50 gold. If your able to destroy the Obelisk you gain 55 gold also gain a buff that allow your 4 auto attack to have 10% increase arm/mage pen and deal bonus magic damage. Last 5min