Ada-1 is selling charge harvester rn, its the next meta for witch queen "kills and assists have a cumulative chance of making you charged with light"
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If your having issues getting charges without Taking Charge you might want to give Sustained Charge, Swift Charge, Precision Charge, Charge Harvester, Powerful Friends, Shield Break Charge, Empowered Finish, Quick Charge, Blast Radius, Precisely Charged, Warmind's Light, Incinerating Light, Light from Darkness, Radient light (for teammates), Charge Harvester, or Elemental Charge (every well making mod now grants charges) a shot.