Helmed Horror's Protection

You have developed some defensive traits similar to that of a helmed horror, granting you the following benefits:

• You gain resistance to force damage.
• Choose three spells. You are immune to the effects of these three spells.
• When you are forced to make a saving throw against a spell or other magical effect, you can use your reaction to give yourself advantage on the saving throw. You can use this feature a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.