I use the build with little modified strategy in the heroic mode, and after defeating the Mayor, my level just upgrades to 23....
Character Code:
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Attribute: all for speed
Ability Tree:
Shock Therapy (1/3), Terrify (1/4), Betrayal (1/4), Free Will (1/4), Retrograde (1/2) -> Shock Therapy (1/3) -> High Voltage (1/4) -> Electrical Storm (2/4) -> Wraith Form (1/1) [Lv8] -> Retrograde (2/2), Shock Coma (3/3), Overdrive (1/1), Epiphany (1/4), Psychopath Form (1/1) [Lv12] -> Dark Echoes (1/4), Destruction (1/4), Salvation (1/4), Tenacity (5/5) -> Free Will (4/4) [Lv23]
Lv8 Combat Action Bar:
Dark Infusion
Corruption
Terrify
Shock Therapy *2
Electrical Storm
Free Will
Wraith Form
Battle Strategy:
Round 1: Wraith Form (+50 Focus)
Round 2: Dark Infusion
Round 3: Corruption (-20 Focus)
Round 4: Dark Infusion
Round 5: Corruption (-20 Focus)
Round 6: Dark Infusion
Round 7: Terrify (-7 Focus)
Round 8: Corruption (-20 Focus)
Round 9: Dark Infusion
Round 10: Free Will (-5 Focus)
Round 11: Electrical Storm (+12 Focus *3) or Corruption (-20 Focus)
Round 12: the same as Round 1
Shock Therapy (-15 Focus) if needed at any time
Above Lv12 Combat Action Bar:
Shock Coma
Shock Coma
High Voltage
Retrograde
Free Will
Electrical Storm
Psychopath Form / Electrical Storm
Wraith Form
Battle Strategy:
Round 1: Shock Coma
Round 2: Shock Coma
Round 3: High Voltage
Round 4: Retrograde, 1st enemy
Round 5: Free Will
Round 6: Psychopath Form
Round 7: High Voltage
Round 8: Shock Coma
Round 9: Shock Coma
Round 10: Retrograde, 2nd enemy
Round 11: Free Will
Round 12: Wraith Form
Round 13: High Voltage
Round 14: Electrical Storm or Rest
Round 15: Shock Coma
Round 16: Shock Coma
Round 17: Retrograde, 3rd enemy