Volcanic Dragon Wyrmling

Volcanic Resistance: This Dragon is immune to Fire damage and anything that's deals with heat as a form of its Damage. 
Rocken Scales: This Dragon is resistant to nonmagical weapons. 

Draconic Wisdom: This Dragon has access to fire-based spells up to the 5th level. 

Bite. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 16 (1d20 + 6) piercing damage plus 6 (1d4) Volcanic damage.

Volcanic Breath (Recharge 2–3). The dragon exhales an Fiery blast of hail in a 15-foot cone. Each creature in that area must make a DC 14 DEX saving throw or be trapped in 20ft of Lava rock that every 12s will fill with a foot of lava forcing anyone in the lava to take 2d8 + 4 Fire Damage to Escape a DC 18 STR check must be made breaking all of the rock, and on hit take 40 (8d8) Volcanic damage on a failed save, or half as much damage on a successful one.

The Volcanic Power: As a Bonus action this dragon can surround itself in ashen rock and stone that emits heat of it dealing 2d4 + 4 Volcanic Damage and adding 3 to its AC for the next 5 turns. This  Action can only be used once for every 7 turns that pass. 

Ancient Draconic Runic Understanding: The Dragon has a partial understanding of what Dragon Runes are and as Bouns Action it can use simple Dragon Runes their Effects follow. (Shatter, Lowers the AC of anything Targeted by 1d8), (Inferno, spawns a small pillar of fire at the feet of a target dealing 2d8 + 6 Volcanic Damage leaving the target more vulnerable to being ignited DM decision.), (Wall, The Dragon creates an outer shell around itself that will deflect any spell above 3rd level up to 8th level this wall lasts for 3 turns of combat the Dragon heals for 1d12 while in this shell per turn and while in this shell AC is increased by 1d4 + 1). This Bonus Action Can only use 1 effect at a time and can only last for a maximum of 5 turns per effect. 

Reactive Scorch: When the Volcanic Dragon is hit with a weapon or magic it can use the action to stretch its rock-like body to trap the weapon or magic within its scales dealing 1d4 + 1 to the user of the spell or weapon. When a spell is trapped the Dragon gains access to that spell for as long as it's trapped. To trap a spell the Dragon must make a DC 18 CON check throw. This effect of Trapping a spell only lasts for 1 turn and at the end of this the Dragon is healed for 1d8 + the spell's level as long as the dragon does not use the spell.