Blade Discipline
Weapon Swap only performs sword swap. You cannot use your crossbow.
In the game
Where to get
Show on the tree It opens the Human tree, shown with the Elemental Ranger archetype.
It opens when any one of the nodes it needs has a point.
Numbers
Tree
Human
HumanUpgrades
Weapon Swap: Blade Discipline
Weapon Swap: Blade DisciplineWhat it changes
Every swap goes to the sword; no number changes with the level.
This part of the spell's code changed in a later game update, so we show no number.
Weapon Swap Strike Damage Increase III
Crossbow Discipline