Chiosa's Goodbye / Magical Devices / Copic Marker

Before the creature's leg can hit you it gets blasted away by a ray of light. Chiosa is now standing in front of you facing the spiderlike monster.
"This is just too huge for us! We cannot defeat it!", you say with your head still pounding painfully.
"I can... but I was hoping to find another way.", Chiosa almost whispers.
"What? How?", you shout against the raging creature and the shadows that approach you from all sides.
"I could have done it earlier, but I was too weak... it is my fault", she says while looking at you with a sad expression. Then she summons a white glowing dagger.
"Hey you!", she screams with all her heart. "This is for all the lives you've taken!", with another ray of light she destroys the creature's second arm. "And this is for him!", she finally adds ramming the dagger right into the green gem on her forehead. A blazing light comes out of it, followed by an explosion that devastates the monster with all the shadow creatures it summoned...