Splitstaff are Weapons in Nioh 2 and information about their stats is shown below. This weapon works in conjunction with the Splitstaff Skills skill tree. Splitstaff scale primarily off of the Magic Stat, but also scales off of Courage and Strength.
Splitsfaffs have the unique mechanic of Fluid Form, which allows you to hold the button used when attacking to change the properties of the attack done, either giving them more range, damage or increasing the amount of hits done, at the cost of increasing the amount of Ki used and generally having slower and longer animations. Because of this, despite being on the lower end of how many active skills it has, the attacks it does have posses multiple different applications. It also has some of the most mobility options and evasive attacks among weapons, in addition to some of the longest range in both length and in a radial area. Finally, every splitstaff is considered a striking weapon, which increases their Ki damage, giving it some of the best Ki damage available. This comes at the cost of generally being a low damage per second weapon outside of Dragon Dance and held High Stance Quick Attacks, and lacking a really high damage, single hitting attack outside of Roar Power, a rare drop Boss Skill from the first DLC, which you cannot access until you beat the game once.
Below is a list of Splitstaff in Nioh 2, and each Spear has an effect that will ALWAYS be present, no matter what other random bonuses there may be, and these are listed in the "effect" column. Damage values are not listed since these change by rarity and level, making it difficult to compare them easily. Break and Block are listed, since these do not change with rarity or level.
Every Weapon in the game has Familiarity. The better quality of the weapon, the more Familiarity can be obtained with the weapon, and over time the damage and bonuses of the weapon will improve as the Familiarity increases up to a maximum. This way, using the same weapon over time can yield higher damage than another, even if it's lower level.
Please see Splitstaff Skills for more information.