They both enter the cave, but right after that a big snake of hundreds of meters comes and when he tries to bite Lucy, Black Will kills him with a single strike of his sword. There are hundreds of them, it's like they know the fact that he and Lucy will come there, but last all of them were killed by a single man with one strike. After travelling some distance Lucy slipped and started sliding into a cylinder shape deep hole. Black Will directly dived into that hole, and placed Lucy on his chest, while his back was sliding against slippery rocks. Black Will stop their motion by using foot friction and manage to stop for some time, surrounded by slippery rocks. Lucy panics when she sees lava at the bottom of the hole, but what is more frightening is that the lava colour is purple, and this Lava can melt magic. Black Will sees a small path near lava to escape. He throws Lucy directly in the direction of the path, and with his skills, he can do that safely.
The rock on which his foot is making pressure so he can't fall into the lava, break up, and he directly falls into the lava. "Blake." She shouts, but he comes out of that lava like it was simple water for him. "Oof! you always surprise me." they escape from that path, and reach an open area in a cave, and there is again one more path visible. But to reach there they have to climb twice. A good-looking man is standing at the top of the path. "You are in my territory, my name is kung hung, son of the owner of this cave, my great-father." Lucy interrupts him, "Great my a... she stops, your father isn't even a demon king, he is just an avatar of demon king, and thanks to that weird introduction at the start of the cave, if I have to guess then I think it was probably you who wrote it there, right?" Black Will put his hand on Lucy's mouth. "Oh, I think he is well aware of me." Black Will tells Lucy in a low voice, "Kung hung in an ancient language means immortal being." and hides Lucy behind his back.
He starts laughing. Lucy comes out of Black Will back, "Why are you laughing, I am not afraid of someone like you, who destroys many lives for their fun, your whole demon family is shame in the universe." she pauses, "Blake, I dint mean it for your mother." He pats her head gently and again hides her in his back. "You aren't afraid of me, you fool." He starts transforming into something else.
Now after transforming, he has two horns, and red skin that looks like shredded muscles burnt, two long wings. He has no eyes but still can see everything. He passes a creepy smile. "I win on you guys, the moment you come here, he removes a little more darkness in that area, and what was hiding behind that darkness was pink colour flowers and a lot of them. These flowers continuously release something into the air. Black Will does not feel good after this. He teleports right behind Lucy, "I don't know why you aren't using your powers of 5 stones from the start, but you know that there are many beings who want your powers, and I am one of them." He tries to grab her, but the next thing he sees is a punch coming in his direction with a cracking sound like it is cutting the surrounding air, Kung dodges it, and when it hits the rocks of the cave it destroys them in such a way that outside of the cave will now be seen. "Oh ho, your body is trembling but you still want to fight, I guess..... die then." He grab him and start flying so fast into a cave trying to stab him with his big claws at his helmet, but Black Will also fought back, and he has not had that much experience in fighting in the middle of the air, Lucy sees two lights, black and red moving fast in the air, and crossing each other with big blasting sound. Black Will fades in the middle of the fight for 2 seconds because of poison in air, using this as an opportunity kung hung throws him out of the cave by hitting him with his claws, and with a big impact he hits the ground. "Now now, where are you Lucy, wait how you reach there, oh your powers." she is healing him with all his energy, "No use in doing that because see in your surroundings there are also the same pink flowers as back in the cave, and to tell you a fact these flowers release a poison in the air which blocks the mind from working for its body, and the reason he is affected by it so easily because he doesn't have magical powers, and the reason we don't fall even after smelling it because we have powers which help us to awake even after this gas effect."
"To answer your question why i don't use my powers because i made a promise with him that i will not use my powers to fight i will use this power to save lives, and he assures that he will protect me."
She still tries to heal him, but nothing good comes out of it, Kung hung lift his arm and makes a small bright point blue circle shape ball near his nails, and releases it in the direction of the ground, seeing this Black Will covered Lucy's whole body, and when this small bright ball hit ground turn its size into so massive, and rotates so fast with thunder sound, and big explosion happens after that, and Black Will hit the ground at some distance, and Lucy was ok because all impact was taken by him. His helmet was completely broken, and his armour also broke badly, his face can now be seen with blood coming from his ears and nose.
Lucy move one step, but in the blink of a time Kung hung reached her back and try to strike him with his claws, but he stops, each muscle shivered when he see Black Will's death stare and start talking to himself in his mind, "wait but why, when I look at his eyes I saw a punch coming towards me, I tried to dodge it by using my future knowing, and reality manipulating powers, but that punch still followed me, and why I am so scared of him, he is a fk*** immortal, compared to him I lived like thousands of his life, I never feel this excited before." he smiled creepily. He again try to strike Lucy, and this time Black Will who was on the ground push his whole body in the air in the direction of him, just by using his one-hand force, he move so fast that time stops, "Crap, this punch is coming towards me, and now I can't see anything except this punch, and a black screen with the clear word 'Death' ."
An old man with a big beard, and a big moustache, and bend back, stop them just by moving his finger from one direction to another, and by doing this he pushes kung hung at a certain distance, the same as he did with Lucy and Black Will.