Each path is a certain stat.
Ghoul path = Strength and Vitality
Darkness path = Agility and chakra
Vampire Path = Vitality and strength
Soul Devouring Path = Chakra and chakra control
Soul Path = Chakra control and chakra
After achieving rank three in a path you can use 100,000 points to make it a middle path instead of lower path
Ghoul path ------> Demon path
Darkness path ------> Void path
Vampire path ------> Blood path
Soul Devouring path ------> Devour path
Soul path ------> Spirit path
Ghoul path - Greatly strengthens the host's skin to the levels of metals, also slightly increases the host's regeneration. Gives the ability to absorb academy level flesh. Grants host small necromancer abilities.
Darkness path - Greatly boosts the host's agility, also slightly increase host's chakra. Gives the ability to absorb materials faster with eyes. Grants host small amounts of dark chakra.
Vampire Path - Greatly boots the host's life span and regeneration, also slightly increases the host's strength. Gives the ability to absorb academy level blood. Grants host small control over their own blood.
Soul Devouring Path - Greatly boosts the host's chakra, also slightly increase the host's ability to control chakra. Gives the ability to absorb larger materials with eyes. Grants host small boost to all stats when a soul has been absorbed.
Soul Path - Greatly boosts the host's ability to control chakra, also slightly increases the host's chakra. Gives the ability to absorb academy level human souls. Grants host one-meter area soul