Arcane Dagger

Casting this spell allows a dagger of your choice to become embued with arcane energy, allowing you to access the following effects. Firstly this dagger will be considered magical for the sake of overcoming resistance and immunity. Secondly, if you throw this dagger at a target it will then reappear in your hands after the attack. In addition to this, you are also able to magically hide the dagger which can only be found with a high enough arcana or investigation check ( DC 10 at 1st level, DC 15 at 5th level, DC 20 at 11th level, and a DC 25 at 17th level). Finally, the dagger increases to a +1 weapon at 5th level,  a +2 weapon at 11th level, and a +3 weapon at 17th level. The magic only exists in the dagger for the duration.