Killing Phloria would achieve nothing but a trip to the resurrection chamber, leaving the Apophis empty-handed.
She, instead, had no problem hammering him with darkness spells aimed to kill. The mind link with Orsat and Ernas' Full Guard allowed the Griffon Knight to perfectly harmonize with her partner and her spells to never miss their target.
"Remember the plan!" The Red Griffon said. "The goal is to take out Verhen and kill as many members of the Council as we can."
"And you remember my deal with the True Queen!" Phloria replied. "She promised me that Lith and I would be reunited so we need to take him alive."
Meanwhile, Lith had taken it easy after the first Ruin in order to regain his strength. He had followed Phloria with his eyes ever since her appearance on the battlefield and had noticed how the Griffon Knight kept herself on the opposite side.