After being reworked the Conqueror rune proved itself to be completely overpowered to the point that some champions such as Cassiopeia or Swain suddenly became constantly banned.
Thankfully, Riot Games is currently testing a nerf that should hopefully restore some balance in the mid lane.
• Ranged champion heal reduced: 15% → 8% of damage dealt
• Buff duration reduced: 8s → 6s
• Warded: Now tells you how much damage it has dealt and how many buffs it has granted. Buffs include: Lethal Tempo's attack speed, Fleet Footwork's Haste, Press the Attack's Vulnerable, Conqueror's Enrage, Hail of Blades' attack speed, Predator's Haste, Phase Rush's Haste, Summon Aery's shield, Aftershock's resistances, or Glacial Augment's slow
• Predator: More likely to get Predator when not near enemy champions, and less likely to get it when in combat with nearby enemy champions
• Dark Harvest: More likely to get Dark Harvest when near low health enemy champions
• Hail of Baldes: More likely to get Hail of Blades when near low health enemy champions and building attack speed or attack damage
• Conqueror: More likely to get Conqueror when both you and enemies have high health (increased chance if you're a melee champion)
• Fleet Footwork: More likely to get Fleet Footwork if you are low health and below level 9
• Glacial Augment: More likely to get Glacial Augment if you have a Glacial item off cooldown
• Summon Aery: More likely to get Summon Aery when you have healing/shielding power and are near a low health ally who is in combat
