Salamander's Prowess

You have developed traits similar to that of a salamander, granting you the following benefits:

• Increase your Strength or Constitution by 1, to a maximum of 20.
• Once per turn, when you hit a creature with a melee weapon attack, you can deal an extra 1d4 fire damage. When you reach 11th level, this damage increases to 1d6.
• When you finish a long rest, you can choose to give your self vulnerability to cold damage in exchange for immunity to fire damage, for 24 hours.