Demons are champions with a connection to the evil entities of Runeterra. Demons steal mana from their target and add to their own. This allows them to use their special abilities more often and help prevent the opponents from using theirs.
Strategy[]
Demons do well against traits and champions that rely on their special ability to do damage that also have a high amount of mana required. Examples include Sorcerers, Elementalist, Miss Fortune, Katarina and plenty more.
Items[]
Since Demons gain mana faster than most other traits, they can make good use of spell power items built from Needlessly Large Rod.
The more attacks or targets the Demons can hit the better.
Runaan's Hurricane allows them to hit multiple targets and gives them a chance to steal mana from 2 enemy champions.
Guinsoo's Rageblade and other attack speed items help to attack more often, giving more opportunities to steal mana.
Blade of the Ruined King with an active Blademaster synergy will allow a demon to steal mana from a single target with a single attack multiple times.
Hush can help prevent the enemy from gaining any mana, while the Demon synergy takes away their current mana.
The trait item, Darkin can be applied to any champion to make them benefit from a demon synergy. Good targets for this item would be champions that can apply on-hit effects to multiple targets like Volibear, or champions with their Blademaster or Gunslinger synergy active.
Graves is a particularly appealing choice for Darkin because his passive allows him to apply on hit effects to everyone in his cone of attack, and he gets the Gunslinger synergy also.
Counters[]
Champions like Akali and Yasuo have low cost special abilities that will charge faster than the Demons can attack.
Items that make charging mana faster or easier like Seraph's Embrace and Spear of Shojin can help charge mana faster than the demons can take it away.
A majority of the Shapeshifters only need to charge there mana bar once. After they do that, they are essentially immune to the Demon synergy.
Graves, Jinx, Vayne, and Kassadin don't use mana at all, and don't suffer from the siphoning.
Champions that rely on basic attacks more than their special ability do well against the Demons. Blademaster, Gunslinger, and Zed are examples of champions in this group.
Hush will prevent the mana Demons gain normally and through their synergy.
Demon's basic attacks have a 40% chance to reduce target's Champions hit by Piltover Peacemakers (Q) at greater than 75% of max rangecurrent mana by 20 and restore 15 / 30 / 45 (based on the number of Demons) mana to the Demon.
Old Effect:
Demons have a 20 / 35 / 60% (based on the number of Demons) chance on-hit to deplete the target's Champions hit by Piltover Peacemakers (Q) at greater than 75% of max rangecurrent mana and deal Skillshots dodged with Void Surge (Q) true damage equal to the mana depleted.
Synergy: Demons have a 30 / 50 / 70% (based on the number of Demons) chance on-hit to deplete the target's Champions hit by Piltover Peacemakers (Q) at greater than 75% of max rangecurrent mana and deal Skillshots dodged with Void Surge (Q) true damage equal to the mana depleted.
Runeterra. Demons steal mana from their target and add to their own. This allows them to use their special abilities more often and help prevent the opponents from using theirs.
Sorcerers, 
