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Hitbox is a mechanic which determines the size of a player or an enemy entity.
The bigger the hitbox is, the easier it is to target with heal, and the easier it is to hit a target from farther away.
Opposed to that, the smaller the hitbox is, the harder it is to target a player, and the closer it is required to get closer to an enemy.
By these standards the Elin race is the best to play for pvp battles simply because their hitbox is so small. The Baraka are the easiest to hit making them the worst to play if only looked at from the perspective of hitboxes. Each race does have unique features though and the smaller races (Popori and Elin) tend to not have good pvp skills built into them whereas the other races do.