In Manafinder I, Lambda was able to wield a LOT of weapons. In Manafinder II, each character knows how to use 2 different weapon types (for a total of 12 weapon types).
But this time, each weapon type has multiple weapons with a masterable Unleash skill each. In most cases, using the Unleash skill ten times is enough to master it. Once mastered, you may use that Unleash skill regardless of the weapon you have equipped. This adds yet another layer of strategy as different Unleashes can be used for different situations: crowd control, defense-piercing attacks, multi-hit attacks, etc.
It also makes finding or buying a new weapon more exciting, since it’s more than just seeing the stats go up: You get a new Unleash skill, and you get to see how the weapon was drawn in the attack animation.
Rey can wield spears and pickaxes.
X’antek isn’t shown attacking in the trailer, but here’s a GIF of his Armblades attack animation.
Astrea’s attack animation