Here's the very beginning
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As Aeth dodged through the melee of warring naval factions, the only thought in her mind was
"I'm not supposed to be here"
An arrow grazed her sleeve.
I'm getting a little too close the the action, she thought worriedly.
Aeth snatched up a bloody knife from the saturated deck and continued to make her way towards the mainsail. She planned on climbing up to the crows nest, and awaiting the end of the battle in relative safety. A flying dagger pinned itself into the wall of the cabin behind her. Aeth caught her breath sharply and faltered, but soon, realizing the urgency of her situation, tugged the knife out of the splintered wood and continued crawling. At last she reached the mast, and, with the knife's handle gripped tightly between her teeth, she began the long and treacherous ascent to the crows nest. Every inch threatened to hurl Aeth off into the roiling sea. She felt helpless and exposed so high in the air. About halfway to the top, Aeth heard a commotion from below, not unsimiliar to a murder of crows squabbling over an insect. She chanced a peek down, but looked up again instantly, reeling from the sheer height. She allowed herself a few moments to recover, then glanced downward once again. The men on deck had ceased their projectile exchange, and were wildly gesticulating up towards her.
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It's set in a somewhat medieval time, I think I'm going to add some fantasy in there though.