Flameskull's Power

You have developed traits similar to those possessed by a flameskull, granting you the following benefits:

• Increase your Dexterity or Intelligence by 1, to a maximum of 20.
• 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.
• When you take cold, fire, or poison damage, you can use your reaction to instead take no damage. When you use this feature, your Strength score is reduced by 1d4. You die if your Strength score is reduced to 0, rising as a flameskull 2d12 hours later. Otherwise the reduction lasts until you finish a long rest.
• When you take the Attack action, in place of one of your attacks you can shoot a ray of fire at a creature that you can see within 30 feet of you. Make a ranged spell attack against the creature, using your Intelligence modifier for the attack roll. On a hit, the target takes 1d6 fire damage. This damage increases by 1d6 when you reach 5th level (2d6), 11th level (3d6), and 17th level (4d6).