Arthur and becks split up . They knew the others were in trouble. That general 48 and Finn had taken them hostage.
Becks runs alongside Arthur as they see the exit to the forest. Which would lead to there mansions backyard. But just as they reached the exit; the final boss was standing there awaiting the arrival. Marianne stood tall on the hill. Her wings sprawled out as becks and Arthur both stood there. Wide eyed in shock. This was there first time seeing Marianne since her disappearance. Her pupils still dark red as she soars up into the sky. Only to land on her feet right behind them.
Arthur turns to becks as he yells
" RUN!"
thankfully becks is able to run away. Just as Arthur turns Mari slams into him hard.
" Mari stop!"
Arthur begs
But she wasn't herself, in fact far from herself. The darkness had taken her fully and her one job was simple.
KILL ARTHUR

Arthur pushes mari off as she flies up. Landing on the branch in a tree above.  Arthur backs away in fear as he looks up. Mari hiding in the darkness above. He couldn't see her on the branch above.
She swoops down tackling Arthur hard as he does a flip . Avoiding the hit. Causing mari to ram herself straight into the tree . She winces at first but then regains her strength. Rising to her feet as Arthur throws punches. She does the same back as they both fight each other.
The fight goes on for five minutes. That is until Arthur uses all his strength to slam Mari into the tree. Maris necklace falls off and rolls to arthurs feet. She lays there collapsed against the tree. As soon as Arthur picks up the necklace Maris eyes go back to blue instantly. Her wings tuck behind her back as she leans against the tree hazily . Trying to regain her strength as she comes down from the darkness that just left her.

Arthur notices her change in demeanor as he chucks the necklace into the river . Then he approaches Mari.
Arthur sits on his knees in front of her as he brushes a strand of her red hair out of her face. Mari looks up at Arthur staring into his eyes as he kisses her forehead.
Instantly causing her to burst into tears.
Arthur pulls her close as he lets her sob into her chest.
" I'm sorry God I'm so sorry-!"

" It's okay your safe now I got you...."
Arthur whispers in her ear reassuringly
" It's not your fault ..."

Mari sniffles as she stares into arthurs eyes again. Then she speaks
" General 48 and Finn took the others."

Arthur sighs out of anguish as he nods. Knowing this was going to be another hectic battle.

" I got a plan."
Arthur looks up at Mari as she rises to her feet determination in her eyes to make things right. To save her family.

" I'll take you to general 48 as if I killed you. We'll attack him when he has is guard down.
I'll put you near the others so that while I distract Finn and general 48 you can untie them. Then WE FINALLY FINISH THESE TWO ONCE AND FOR ALL"