The way ladder slasher works teash is::
On the thing you attack with, you want EE aka Enhanced Effect.
For a melee character, that is their weapon.
For a caster ( like magician ) that is their MAIN charm.
Other items you use are stats and def.
For melee:
You want dex and str on your charm and armor.
For caster:
You want inteligence on your weapon and armor.