When stabbed by the dagger, the creature must succeed on a constitution saving throw DC 8 , otherwise it wont be able to use any spell for their next turn.
When you throw the dagger if hit , the dagger will paralyze the target rending him stunned on the ground and cancelling any magic the target previously used.
The target must succeed on a constitution saving throw DC 10 to be un-stunned.
Proficiency with a Handaxe allows you to add your proficiency bonus to the attack roll for any attack you make with it.
This weapon has the following mastery property. To use this property, you must have a feature that lets you use it.
Vex. If you hit a creature with this weapon and deal damage to the creature, you have Advantage on your next attack roll against that creature before the end of your next turn.
Notes: Weapon Property: Finesse, Replace Damage Type: Piercing, Light, Thrown, Vex