Wait, even so, I still can cast a form of magic

By accepting herself being afflicted by holy element by surprise and raising her Defilement level to 2 (she's a heretic to Iziza even as she worship her, so she got a defilement by defiling her own deity, yea monster logic), this count as a Sacrifice, prompting a Requirement for a Tier 1 Ritual (or Tier 2?)

the ritual spell will be enabling the succubus to Absorb the dead victims to recover her from Partial Paralysis (Tier 1) or Draining the still fighting woman (Tier 2)

call GM mechanism [@Mae]