The copper dragon

Your patron alows you the dragons sense 

Lv6 Copper Dragon Sense: blindsight 30ft, darkvison 30ft,

+3 perception 

Dragon scales: Acid Resistance

 Dragon scales: Acid Resistance

Copper dragon sense

blindsight 30ft, darkvison 30ft,+3 perception 

Dragons jaw

 make a grapple attack advantage on a success deal 2d6 peircing damage, and for each turn they're grappled they take 2d6 acid damage 

Dragons breath & saliva

in a 30 ft cone spew a melting acid gas while in the gas you take 2d6 acid damage & must make a Constitution saving throw. On a failed save, the creature can't use reactions, its speed is halved, and it can't make more than one attack on its turn. In addition, the creature can use either an action or a bonus action on its turn, but not both. These effects last for 1 minute. The creature can repeat the saving throw at the end of each of its turns, ending the effect on itself with a successful save