There are Legacy versions
here and
here.
Adult Magma Dragon
Magma dragons represent a brash and volatile aspect of dragonkind. Territorial and unpredictable, magma dragons are known for protecting their hunting grounds with a fierce and proud demeanor that brooks no challengers. Passionate in the extreme, magma dragons in their draconic forms can often seem utterly bestial, impulsively jumping at threats and challenges with a wild abandon, but this belies an intellect that many underestimate.
Huge Dragon Fire Primal
Source Draconic Codex
pg. 140
Recall Knowledge DC 31 • Dragon (Arcana)
Perception +23; darkvision, scent (imprecise) 60 feet
Languages Common, Draconic, Petran, Pyric
Skills Acrobatics +21, Athletics +27, Deception +19, Intimidation +25, Nature +21, Stealth +21, Survival +23
Str +8, Dex +2, Con +5, Int +2, Wis +4, Cha +4
AC 33; Fort +25, Ref +21, Will +23; +1 status to all saves vs. magic
HP 270; Immunities fire, paralyzed, sleep; Weaknesses cold 15
Frightful Presence (aura, emotion, fear, mental) 90 feet, DC 30Wing Deflection [reaction] Trigger The dragon is targeted with an attack; Effect The dragon raises a wing, gaining a +2 circumstance bonus to AC against the triggering attack. If the dragon is Flying, they descend 10 feet after the attack.
Speed 40 feet, burrow 40 feet, fly 140 feet; magma burrow
Melee [one-action] jaws +27 [+22/+17] (fire, magical, reach 15 feet), Damage 3d8+12 piercing plus 2d6 fireMelee [one-action] claw +27 [+23/+19] (agile, magical, reach 10 feet), Damage 3d10+12 slashingMelee [one-action] tail +25 [+20/+15] (magical, reach 20 feet), Damage 3d12+12 bludgeoningMelee [one-action] horn +25 [+20/+15] (magical, reach 15 feet), Damage 2d10+12 piercingPrimal Innate Spells DC 33, attack +23; 6th breathe fire (at will), wall of fire (at will); Cantrips (6th) ignition
Change Shape [one-action] (concentrate, polymorph, primal) The dragon takes on the appearance of a Medium humanoid. This does not change their Speed or their attack and damage bonuses with their Strikes but might change the type their Strikes deal (typically to bludgeoning).Draconic Frenzy [two-actions] The dragon makes two claw Strikes and one horn Strike in any order.Draconic Momentum The dragon recharges their Pyroclastic Breath whenever they score a critical hit with a Strike.Magma Burrow A magma dragon's burrow Speed functions only when the dragon is Burrowing through magma or molten lavaPyroclastic Breath [two-actions] (fire, primal) The dragon breathes a blast of magma that deals 7d6 fire damage and 4d12 bludgeoning damage in a 40-foot cone (DC 33 basic Reflex save). They can't use Pyroclastic Breath again for 1d4 rounds.Volcanic Purge [one-action] If the next action the dragon uses is Pyroclastic Breath, the magma clings to those it damages. Each creature that fails its save against Pyroclastic Breath takes 4d6 persistent fire damage, and as long as it has this persistent fire damage, it also takes a –10-foot status penalty to its Speeds.Source Draconic Codex
pg. 139Magma dragons represent a brash and volatile aspect of dragonkind. Territorial and unpredictable, magma dragons are known for protecting their hunting grounds with a fierce and proud demeanor that brooks no challengers. Passionate in the extreme, magma dragons in their draconic forms can often seem utterly bestial, impulsively jumping at threats and challenges with a wild abandon, but this belies an intellect that many underestimate.
Dragon
Related Groups Dragon, Adamantine,
Dragon, Barrage,
Dragon, Bog,
Dragon, Brine,
Dragon, Cinder,
Dragon, Cloud,
Dragon, Conspirator,
Dragon, Coral,
Dragon, Crystal,
Dragon, Delight,
Dragon, Despair,
Dragon, Diabolic,
Dragon, Empyreal,
Dragon, Executor,
Dragon, Forest,
Dragon, Fortune,
Dragon, Horned,
Dragon, Mirage,
Dragon, Mocking,
Dragon, Oath,
Dragon, Omen,
Dragon, Phase,
Dragon, Requiem,
Dragon, Resurrection,
Dragon, Rime,
Dragon, Rune,
Dragon, Sage,
Dragon, Sea,
Dragon, Sky,
Dragon, Sovereign,
Dragon, Stormcrown,
Dragon, Time,
Dragon, Umbral,
Dragon, Underworld,
Dragon, Vizier,
Dragon, Vorpal,
Dragon, Wailing,
Dragon, Whisper,
Dragon, Wish,
Dragonet,
WyrmwraithDragons come in myriad forms, with many having magical abilities or connections to magic. Some dragons draw greater power from magic than others, allowing them to manifest abilities or alter their physiques with prolonged exposure to magic. These dragons become more powerful as they age and strengthen their connections with their magical origins. Scholars debate the classification of these dragons, with some preferring the name magical dragons and others using traditional dragons due to their connection to specific magical traditions. Regardless of their names, these dragons share a number of characteristics: their ability to tap into magical energies, intensified might and cunning as they grow older, and an inclination to hoard vast amounts of treasure and wealth.
Draconic Spellcasters
Each dragon features a sidebar on spellcasting dragons of that type. To make a dragon spellcaster, remove the dragon's Draconic Frenzy and Draconic Momentum abilities, and give them the spells outlined in their sidebar. You can swap out any number of these with other spells, provided you keep the same number of spells for each rank. You might also want to increase the dragon's Intelligence, Wisdom, or Charisma modifier by 1 or 2 to reflect their mastery of magic.
Magma Dragon Spellcasters
Magma dragon spellcasters often know the following spells.
Young Magma Dragon
Primal Prepared Spells DC 28, attack +20;
4th fireball,
mountain resilience,
wall of fire;
3rd fireball,
haste,
slow;
2nd mist,
revealing light,
sound body;
1st air bubble,
grease,
vanishing tracks;
Cantrips (4th) detect magic,
ignition,
prestidigitation,
read aura,
sigil Adult Magma Dragon
Primal Prepared Spells DC 33, attack +25; as young magma dragon, plus
6th fireball,
petrify,
truesight;
5th fireball,
toxic cloud,
wall of stone;
Cantrips (6th) detect magic,
ignition,
prestidigitation,
read aura,
sigilAncient Magma Dragon
Primal Prepared Spells DC 40, attack +32; as adult magma dragon, plus
8th desiccate,
earthquake,
fireball;
7th fiery body,
fireball,
volcanic eruption;
Cantrips (8th) detect magic,
ignition,
prestidigitation,
read aura,
sigil Magma Archdragon
Primal Prepared Spells DC 44, attack +36; as ancient magma dragon, plus
9th falling stars,
massacre;
Cantrips (9th) detect magic,
ignition,
prestidigitation,
read aura,
sigil 
