Board Thread:Antaeus' Arena: Audience Chamber/@comment-1515612-20160820001629/@comment-38139539-20190126085205

Percy has/can: Heal/fight using water Great swordplay A sword that returns to your pocket blood-bend(=Ctrl blood) talk with/call a horse, including Pegasus resist fire seaweed brain

Nico has/can: spawn/kill skeletons Ghostify A sword that can harm mortals Shadow travel Sense spirits spawn a wall make people sleep

Now, let's don't consider blood-bend and ghostify because they were only used once. Also, Percy was in Tartarus when doing blood-bend; and Renya lent Nico power and Nico was extremely angry when he ghostified Bryce.

Shadow travel, sensing spirits, seaweed brain will also be useless because shadow travel and sensing spirits would be meaningless in a battle. Seaweed brains should be also ignored because well... it was a joke.

Since Percy is a Demigod, Nico can't put him to sleep like mortals, so let's leave that out too. Evidence: when God of Sleep put Manhatten into sleep, Percy and the other Demigods were wide awake. Can Nico extend Percy's sleep? Yes. But can he force him to sleep? No.

Lastly, let's take out Percy's 'resist fire' becuase why on Earth would he need that.

Now, then this is left:

Percy has/can: Heal/fight using water Great swordplay A sword that returns to your pocket talk with/call a horse, including Pegasus

Nico has/can: spawn/kill skeletons A sword that can harm mortals spawn a wall

So if there are companions, Nico may spawn skeletons, but Percy would be able to spawn Blackjack, a flying horse. He will be able to evade the skeletons, while overwhelming Nico with waves of swami. Now, though Nico can spawn a wall, he can't block it because Percy's swamis are massive.

If there are NO companions, Percy will either kill Nico with Swamis or a hurricane (part of his water abilities).

If there are NO powers at all, the fight will be chosen by swordplay. A sword that can harm mortals is not going to do much good unless dumb mortal charges at them  for some reason. A sword that returns to your pocket, on the other hand, is way more useful. It is useful because you don't have to worry about losing the sword, and it allows you to throw the sword. Lastly, in terms of swordplay skill, everyone knows who wins. Percy was the best swordsman in Camp Half-Blood in 100 years.

So there were three scenarios, and Percy wins them all. Now, don't get even started on ghostifying, because Percy can kill or at least distract Nico to prevent him from doing such a heavy power with his water powers. When Percy gets tired, he can always heal in the water but Nico will soon wear out, becoming incapable of ghostifying. Before he even realizes, Percy will defeat Nico in that battle. Remember, Nico even conceded that Percy was the strongest demigod he ever met.