Arcane Infused Necklace

If a spell deals damage of a type to which the target is resistant or immune, roll a d4. The necklace grants you arcane knowledge based on the result:

1. You know all the resistances the target possesses
2. You know all the immunities the target possesses
3. You know all the vulnerabilities the target possesses
4. You may choose one from any of the effects above