|"You belong in a museum!"
Flesheater is a legendary item in League of Legends. Flesheater is only available when the event Black Market Brawlers is active. It is also only item available that offers infinite stat growing, similar to old items Feral Flare and pre-V5.13 Devourer.
It would need six stacks to be over.
As truly unique item, there is no other item that grows in power without a cap.
offers much of the same but is beaten in pure damage after 60 stacks.
Collecting the needed 5 stacks from something else than minions (wards, towers, enemy champions) allows you to use the active more often for minions thus increasing the stacks gained per creep wave.