Esmy

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Emsy is a character first appearing in Hollow Knight: Shadownail. He is a bug who was a fellow Nailsage alongside his friend Sly. He is a shopkeeper and an optional boss.

LORE
Esmy used to be a Nailsage who was friends with Sly. He taught the Pure Vessel to fight with the nail. The Pale King recognized Esmy's skill and gave him a large amount of Geo as a reward. After earning the Geo he bought gear to tunnel deep underground to attempt to find special Ores to create an incredibly powerful Nail. But while they were tunneling, they ran into mass amounts of Infection. Emsy and Sly fought back, but eventually, they got overwhelmed. Esmy told Sly to escape, while he fought back against the Infection. Eventually, Esmy got Infected, but the cave had collapsed and Infected Esmy was trapped. After the Knight destroyed The Radiance, Esmy was freed from Infection, and tunneled out. He discovered that Sly had taken up shopkeeping, so Emsy decided to become one too, like his friend.

Current
Esmy now sells many items at his shop, The Wandering Nail, in the bottom right corner of the City of Refuge. He sells many key items, like the Specter Key. But his most prized possesion is the Ultimate Nail, which can only be visible after beating his boss fight. His boss fight is fast- paced and gives only small windows to attack and heal.

Boss Fight
To trigger the fight, you need have bought all other items from Esmy. After finding the Black Blast spell and defeating Void Legend, he will now have special dialogue. He will tell you about the Ultimate Nail, and tell you about a challenge you must first face to win the Ultimate Nail. Upon accepting, Esmy will hit a button in his shop, and you will fall down into a special arena. Esmy will wield the Ultimate Nail, and you will engage in battle.

Attacks
Emsy hits fast and hard, with about a 2- second pause in between attacks, and each attack deals 2 masks each, unless specified not to.


 * Cyclone Slash: Esmy will charge up for about half a second, and then use the Cyclone Slash. Every 1.5 seconds he will send out Grubberfly's Elegy beams too, alternating from right to left. This attack lasts 9 seconds.
 * Great Slash: Esmy will charge up for about half a second, then unleash four Great Slashes in a row. Each Great Slash cause knockback as to prevent being caught in all four slashes. Great Slashes deal 3 masks each.
 * Dash Slash: Esmy will charge up for about half a second, then Dash Slash three times in a row. All of them will be aimed at you, and he can dash diagonally and vertically.
 * Ultra Slash: Esmy will charge up for about 1.5 seconds, and then slash in a massive area. The area covered will be about 66% of the screen, most of it in front of him. He will hit a little above and below him as well. This deals 3 masks of damage.
 * Flurry Slash:  A constant bunch of slashes. The hitbox is small but it deals 1 mask per swipe with no knockback, making it risky to attack or heal at the wrong time.
 * Hop: Esmy will leap around in a high arc, mainly to get around.