How about removing Energy Drain and Energy Siphon?

Fester
Deals unaspected damage with a potency of 300
Maximum Charges: 2
Shares a recast timer with Painflare
Recast: 15s
Cast: Instant

Painflare
Deals unaspected damage with a potency of 130 to target and all enemies nearby it.
Maximum Charges: 2
Shares a recast timer with Fester
Recast: 15s
Cast: Instant