Unexpected Visitor

"Ah! Mimic Shield!" Ace shouted just as his entire body turned hard as iron, the spear bouncing off his skin in time before it could pierce through his left cheek and into his skull, killing him on the spot. 

"That was a close one." He mumbled, looking at his glistening skin. "Thanks, Luna." 

[Please do not mind me, you were the one that managed to activate it on time.] 

"Still, if it was Cleo … I just might die before any kind of help comes." Ace said, narrowing his eyes as he remembered the little fox creature. 

Right, I have to summon it, according to the list that Luna made me. How am I even going to do that? 

When we parted ways, Cleo just gave me an ambiguous parting line, 'Make sure to be concentrating when you summon me. Otherwise, you will summon only half of me and I will die.'