Kereneth

She has flat black scales that take on a glossy texture as it matures. Large plates, which look like shark fins, run down its neck and back.

The dragon's head is almost shovel-shaped, with a pointed snout.

Damage Immunities fire   Senses blindsight 10 ft., darkvision 60 ft., passive perception 14   Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 9 (1d12 + 3) piercing damage.   Superheated Spark Breath (Recharge 5-6). The dragon exhales superheated sparks gas in a 20-foot cone. Each creature in that area must make a DC 13 Dexterity saving throw, taking 24 (7d6) damage (half fire and half lightning) on a failed save, or half as much damage on a successful one.

Armor Class 16   Hit Points 60 (10d8 + 20)   Ability Scores Str 16 (+3), Dex 12 (+1), Con 16 (+3), Int 8 (-1), Wis 11 (+0), Cha 12 (+1)   Saving Throws Dex +3, Con +7, Wis +3, Cha +4   Skills Perception +4, Stealth +3   Speed 35 ft., fly 65 ft., climb 30 ft.

Lawfully Unpredictable. When it comes to the dictates of their hierarchy and clan, nickel dragons loyally follow all laws set forth for them to uphold. They can be counted on to support such laws and enact the will of Gruaghlothor, but their means are often difficult to predict. It seems that, in most cases, nickel dragons do as their conscience directs, within the bounds of clan and self. Their behavior is often erratic, but once a dragon decides on a course of action, it sticks to that course until it is complete or proven fruitless.   Their unpredictability also makes them effective combatants, as even the most well-informed would-be dragonslayers are always surprised by some act of the dragon's. The long and short of it is that each dragon fights differently, and an individual dragon fights differently every time, never utilizing the same tactics twice in a row (if ever). Even tactics that make no sense, such as retreating at the beginning of a battle or charging when it makes sense to retreat, work to the dragon's favor because of the surprise of its enemies.   One tactic that they seem to universally favor and use several times over is hit-n-run, using their ability to swim and breathe underwater to great effect. The catch is that you can never know for sure when the dragon plans to strike, if it plans to strike again at all.   Corrosive Demeanor. The disposition of a nickel dragon is about as caustic as the gas that it spews from its maw. It enjoys bullying creatures smaller and weaker than itself, often insulting and demeaning those with the intelligence to understand it. Occasionally, a nickel dragon may travel a bit out of its way just to find an opportunity to raid for treasure or scare the tar out of a town's populace.

Tenacious Treasures. Nickel dragons like having treasure as tenacious as they are. That is to say that nickel dragons prefer treasure that is hardy and won't corrode in their presence. Nonmagical metals are swiftly traded away or kept in a vault separate from the dragon's main hoard, to keep them from losing their value. Even precious metals, including coins of all varieties, aren't safe from the dragon's corrosive abilities.   When it inevitably acquires large sums of coins (or other nonmagical metal items such as weapons and armor), the dragon tries to trade them away and acquire treasure that is more resilient. They especially covet magic items and gems for this reason, as both are immune to their corrosion.