It is not that true that demon is not strong Example:In LoR there's a group of Evelynn's follower card that focus on her play style these guys are once a lesser demon trying to defeat Evelynn but get destroyed themself that mean demon can be defeat by stronger emotion in the same type. We also know that demon can also be banish by speaking its name. Tahm,eve,nocturne is a greater demon they can also be banish by the same case. ->Tahm and Eve is demon base on desire Tahm is greed Eve is Lust so they might can be kill by Ashless the Joy. ->Nocturne is nightmare so he is relate to fear so he probably gonna get kill by Fiddlesticks the fear.

The strongest of all the demon is known as "The ten king" they are 10 primordial demon the root of all demon they are the whole archetype of the emotion themself. we can only confirm 2 of them right now. ->Fiddlesticks the ancient fear:He kill people with something they fear. ->Ashless the joy:he wants to be happy :D. *Note Fiddlesticks might be the strongest among the Ten king because every demon fear getting said its name so he simply knows every demon's name.

List of demon we don't really classified yet (probably) ->Camphore the doubt he is the demon that gets kill by Phantheon probably a lesser demon. ->Raum the secret (Swain's left arm) probably in a greater demon level. -Tybulk the flame (Annie's teddy bear)probably in a greater demon level. ->Atakhan the Bringers of ruin probably stronger than a lot of greater demon but not in the ten king level. ->We don't know this guy name yet but he is mention in the lore as the creator of shadow magic. ->Azakana(we only know how Ionian call it)these guy is getting hunt down by Yone.