Okay, not many people seem to understand my point. No, we're not including moves in the game. I'm talking about lore only. I'll make my own list of potential candidates, and I'm trying to get meaningful responses
- An ascendant being, capable of creating a memory of his entire city and people in sand, can potentially summon armies with a gesture
- A celestial and universal protector, tasked with fixing entire timelines and was given the power to do so
- The incarnation of destruction and flame, capable of bringing upon an apocalypse
- Can potentially grow large enough to devour worlds
- Invokes the power of a god
- The incarnation of death, but their lore states that they are not beings capable of feeling, and that Lamb is just and doesn't necessarily fight without reason. I would say they are the strongest because everything dies (more or less) and they are death, but they're not evil and never will be so idk
- His requiem is said to be capable of destroying worlds if fully finished, and he defies death through his phylactery. Being a lich, and a smart one, I would imagine he hid his Phylactery well
- Both godlike ascended beings. Nasus was stated to have made even the summoners plead for mercy, and if Renekton is even slightly on par with Nasus, they are both immensely powerful
- Capable of manipulating time, gravity, and space itself. Has been stated to be able to create black holes
- The physical embodiment of arcane power, and wiped out an entire capital city just through the process of becoming what he is now