race features: Chromatic Warding. Starting at 5th level, as an action, you can channel your draconic energy to protect yourself. For 1 minute, you become immune to the damage type associated with your Chromatic Ancestry. Once you use this trait, you can’t do so again until you finish a long rest.
Chromatic Ancestry. You trace your ancestry to a chromatic dragon, granting you a special magical affinity. Choose one type of dragon from the Chromatic Ancestry table. This determines the damage type for your other traits as shown in the table.