Deku the One For All Legend (Bnha multi crossover fanfic)

Sports Festival (Part 2)

Both Izuku and Lucas looked at each other with determination and excitement. Both were determined to win.

"START!" Midnight said.

Play song

The two in a blink of an eye clashed fists into each other creating a huge shockwave. Neither of them using but a little bit of their power.
"You definitely have gotten stronger Izuku." Lucas said.
"Just wait!" Izuku said.
Both Izuku and Lucas started throwing a flurry of punches at each other powering up slowly more and more having the crater beneath them get bigger.
Dust was covering the inside of the magic dome.
Nobody could see what was going on, all they could hear were the clashing of fists.

Both fighters pulled back. Izuku went one hundred percent full cowling while Lucas started to glow a starry silver color indicating that he powered up. Both were still holding back.
Lucas shot a magic sphere at Izuku, he punched through it and hit Lucas with a right hook. Izuku then poked Lucas in the head in an attempt to disarm his healing spell. Luckily for Lucas, Izuku missed the nerve he was aiming for. Lucas had tons of spells so it was hard to find the right one.

Lucas then started shooting blasts after blasts that Izuku dodged no problem thanks to his fourth quirk known as danger detection. With this quirk he can basically tap into ultra instinct without actually using the technique. Izuku can't go ultra instinct yet but is very close.

Izuku then went five hundred percent of OFA. He threw a million punches at Lucas of which he blocked and then kicked Lucas in the gut which caused him to be pushed back a little bit then started having punches thrown at him with more power than before.
Lucas then grabbed Izuku's wrist and threw him to the ground and shot a blast of which it hit him. Or so he thought. Izuku came up behind Lucas and punched him. Lucas grabbed his fist and drill punched Izuku in the gut which was met with a blast.

Both were struggling to keep up with the other. Lucas knew to avoid Izuku's punches because one poke from him could be fatal. Izuku knew to avoid Lucas's spells because his spells could be dangerous to get hit with.

Both Izuku and Lucas reeled back again. Izuku summoned a ki blade (no, not the one from kingdom hearts!) it was blue with green lightning. He called it the One for All blade.
Lucas summoned a silver scythe that had a dragons head as the pommel. Lucas called it the Silver Dragon Reaper.

Both charged at each other clashing their summoned weapons as sparks flew high in the air with the wind pressure going all inside the dome.

It was finally time for the both of them to go all out.
Izuku went to 990,000% of One for All. He had green lightning glowing around him while his hair stood straight up glowing green.
Lucas started glowing a more faint silver. His aura started growing a pair of wings, three reptilian tails, and a pair of horns over his ears.

This was their full power so far.

They clashed once again having the dome crack slightly at the impact. Whis used his power to keep the dome stable and got rid of the cracks.

Izuku was avoiding Lucas's scythe while Lucas was avoiding Izuku's sword. The fight only grew more intense from there.

They jumped back putting their summoned weapons away. Izuku pulled both his hands back showing a blue sphere with green lightning, while Lucas pulled one hand back with a starry sliver orb with crystal yellow and pitch black lightning surrounding it.

"Ka... me... ha... me..." Izuku charged up his attack.
Lucas charged up his spell to full power and threw it at Izuku.
"TAKE THIS!!!" Lucas shouted.
"HAAAAA" Izuku shouted back clashing his beam with Lucas's star pressure spell.