Hardshell: gives the creature a +4 to Ac when made of Iron or lead, a +2 when made of gold, and a +1 when made of copper, crystal, glass, or softer materials.
Breath weapon:15 ft cone (dex save)
When the creature uses its breath weapon, each creature in the area of the exhalation must make a saving throw, the type of which is determined by its Draconic ancestry. The DC for this saving throw equals 8 + your Constitution modifier + your Proficiency Bonus. A creature takes 2d6 damage on a failed save, and half as much damage on a successful one. The damage increases to 3d6 at 6th level, 4d6 at 11th level, and 5d6 at 16th level.
Dagger: Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 4 (1d4 + 2) piercing damage.
Cobbledobs are reptilian creatures similar to that of a quadrupedal kobold. however they are encased in a thick hard shell of melted metal and weaponry. acting as a shell for defensive purposes. Cobbledobs are skiddish and will sooner curl up in their shell or run away than fight.
Cobbledobs live in burrows and caves that they line with traps and any loot they can amass.