You are a Dragon. ((at 5th level in human avatar you are Humanoid))

Your size is medium as a wyrnling, Large when young, and huge when adult.

Your speed is 30 ft and you have a Flight speed of 30 ft

"Your draconic nature grants you senses far beyond those of lesser beings. With each breath and glance, you perceive the world in layers of sound, scent, and subtle vibrations. Few can hide from the gaze of a dragon."

You have Blindsight with a range of 60 feet.
You also have Darkvision with a range of 120 feet.

In addition, you have advantage on Wisdom (Perception) checks that rely on sight, smell, or hearing, as your keen draconic instincts and heightened physical senses constantly scan your surroundings for even the faintest disturbances.

As a dragon, you possess formidable natural weapons. You can use the following attacks when making an Attack action or as specified below:

• Claw. Melee Weapon Attack: Your Strength modifier + proficiency bonus to hit, reach 5 ft., one target.
  Hit: 1d10 + Strength modifier slashing damage.

• Bite. Melee Weapon Attack: Your Strength modifier + proficiency bonus to hit, reach 5 ft., one target.
  Hit: 2d6 + Strength modifier piercing damage.

• Swallow (Bonus Action).
  When you hit a creature smaller than you with your Bite attack, you can use a Bonus Action to attempt to swallow the target. The target must succeed on a Strength (Athletics) or Dexterity (Acrobatics) saving throw (DC = 8 + your Proficiency Bonus + your Strength modifier), or be swallowed. A swallowed creature is blinded, restrained, and has total cover against effects originating outside you, and takes 3d6 acid damage at the start of each of its turns. The creature can attempt to escape at the end of its turn by succeeding on the same saving throw. You can have only one creature swallowed at a time.

Your lineage stems from a dragon progenitor. Choose the kind of dragon from the Draconic Ancestors table. Your choice affects your Breath Weapon and Damage Immunities traits as well as your appearance.

"Even in your earliest form, your body carries the protective essence of your lineage. Your scales shimmer with innate magic, shielding you from the forces that birthed your kind."

As a Wyrmling (levels 1–4), your connection to your draconic bloodline grants you Resistance to the damage type associated with your Draconic Ancestry (see the Draconic Ancestors table).

• While you are a Wyrmling, you take half damage from this type.

• You retain this Resistance as you grow through the Young Dragon stage.

• Upon reaching Adult Dragon at 11th level, this Resistance evolves into full Immunity as your draconic essence reaches its prime.

Your Resistance is visible to the trained eye: frost crackles and fades harmlessly upon silver scales, acid slides across a black hide without bite, and radiant light refracts harmlessly through crystalline facets. Even in your youth, your enemies quickly learn that the weapons of your element hold no power over you

When you take the Attack action on your turn while you are in your Dragon Avatar, you can replace one of your attacks with an exhalation of magical energy in either a 15-foot Cone or a 30-foot Line that is 5 feet wide (choose the shape each time). Each creature in that area must make a Dexterity saving throw (DC 8 plus your Constitution modifier and Proficiency Bonus). On a failed save, a creature takes 3d10 damage of the type determined by your Draconic Ancestry trait. On a successful save, a creature takes half as much damage. This damage increases by 2d10 when you reach character levels 5 (5d10), 11 (7d10), and 17 (9d10).

You can use this Breath Weapon a number of times equal to your Proficiency Bonus, and you regain all expended uses when you finish a Long Rest.

As a magical action, you can assume a unique humanoid avatar form. This form is the same each time you use this ability, though its clothing and style can be altered when you first assume it.

Your avatar is physically real — not an illusion or projection — and typically takes the form of a Medium humanoid such as a human, elf, dwarf, or other similar race. You do not gain any racial traits or abilities from the chosen form. You retain your own hit points, ability scores, proficiencies, and class features while in this form, and you can still use your Breath Weapon and other dragon abilities normally.

While in your avatar form:

• Your size becomes Medium.

• You lose any ability to fly unless granted by a spell or other feature.

• Your Strength and Constitution scores remain unchanged, but your Appearance and voice match the chosen avatar.

• Your avatar form may not resemble a specific individual unless you choose so when first creating it.

You can assume this form a number of times equal to your proficiency bonus, regaining all expended uses when you finish a long rest. You can revert to your natural form early as a magical action.

Starting at 5th level, when you take the Attack action on your turn, you can make two attacks, instead of one.

You can choose to replace one of these attacks with the use of your Breath Weapon.

At 11th level (when you become an adult dragon), you can make three attacks when you take the Attack action. You can still replace one of these attacks with your Breath Weapon if you choose.

Optional Flavor Box:

"With each passing year, your mastery over your form deepens. By adulthood, you wield tooth, claw, and breath with unmatched ferocity, capable of laying waste to even the hardiest foes in a storm of strikes."

With the passing of years and the forging fires of experience, your draconic body and soul undergo a powerful transformation. The days of your youth fall away; in their place, the majesty of a Young Dragon emerges.”

When you reach 5th level, you enter the next phase of your natural growth — becoming a Young Dragon. Your body strengthens, your instincts sharpen, and your command of both physical might and elemental breath intensifies.

As a Young Dragon:

• Your natural weapons evolve — your Claws now deal 2d8 slashing damage, and your Bite deals 2d6 piercing damage.

• Your Breath Weapon surges in potency, increasing to 5d10 damage.

• You gain the ability to make two attacks when you take the Attack action (Multiattack).

• You achieve true flight: your wings grow strong enough to support sustained, fast aerial movement. You gain a flying speed of 80 feet if you do not already possess it.

• Your presence becomes more commanding, your eyes shining with deeper primal awareness. The world begins to perceive you as a true draconic power, no longer a fledgling.

This transformation is a permanent evolution of your being — a rite of growth earned through adversity and will. From this moment on, you are no longer a mere Wyrmling, but a rising Young Dragon — a creature of legend in the making.

"The slow churn of time, tempered by wisdom and wrought through trial, culminates in the awakening of your true self. You are no longer an emerging power — you are a force of the world. An Adult Dragon in full."

Upon reaching 11th level, you ascend to the prestigious rank of an Adult Dragon — a being of immense physical power, elemental fury, and commanding presence. Your growth is no longer subtle; it is undeniable. The mere beat of your wings shakes the air, and your voice carries the authority of a sovereign.

As an Adult Dragon:

• Your natural weapons now reach their full draconic might — your Claws deal 2d12 slashing damage, and your Bite remains 2d6 piercing damage.

• Your Breath Weapon intensifies, increasing to 7d10 damage.

• You master the flow of combat, able to unleash a relentless flurry of attacks — you gain the ability to make three attacks when you take the Attack action (Multiattack).

• You may replace one of these attacks with the use of your Breath Weapon.

• Your command of your form and flight becomes absolute — you soar through the skies with unrivaled speed and precision.

• Your draconic presence magnifies: creatures instinctively recognize your power, and even the bold may hesitate in your shadow.

• If your species grants damage immunity, it now fully manifests — your scales and essence render you completely immune to your Draconic Ancestry’s damage type (if not already gained).

You have entered the prime of your draconic life — an apex predator, a guardian of ancient truths, or a sovereign force destined to shape the fate of those around you. Few mortals can stand against you unshaken. Fewer still will dare to try.

"Your scales thicken, your magic deepens, and the elemental essence of your lineage fully manifests within you. Lesser forces can no longer harm you as they once did."

Upon reaching 11th level and ascending to the rank of Adult Dragon, your connection to your Draconic Ancestry reaches its pinnacle. The resistance you once held against your ancestral element now evolves into complete immunity.

• You gain Immunity to the damage type associated with your Draconic Ancestry (as determined by the Draconic Ancestors table).

• You no longer take any damage from that element, and you automatically succeed on any saving throws made to resist its effects.

From this point forward, fire may wash over your golden scales without harm, poison may swirl uselessly in the air around you, and even the force of thunder or psychic assault will fail to breach your hardened spirit and body. This immunity is a visible sign of your full maturity as a dragon — a trait possessed only by the mighty and the legendary.

Your character knows at least three languages: Common plus two languages you roll or choose from the Standard Languages table. Knowledge of a language means your character can communicate in it, read it, and write it. Your class and other features might also give you languages.

The Standard Languages table lists languages that are widespread on D&D worlds. Every player character knows Common, which originated in the planar metropolis of Sigil, the hub of the multiverse. The other standard languages originated with the first members of the most prominent species in the worlds of D&D and have since spread widely.

“Dragons do not grow old. They grow mighty.”

Dragons are beings of living magic and raw willpower. Unlike mortals, they do not age into frailty. A dragon will live indefinitely—its power, wisdom, and presence growing ever stronger—until the day it is slain.

Their bodies and magic evolve through distinct life stages, marked more by personal growth and mastery than by years alone. In your adventuring life, your growth follows this natural progression:

• Wyrmling: At birth and during your early years, you are a Wyrmling—small, quick, and brimming with potential. Wyrmlings are often underestimated, but their adaptability and magical instincts make them formidable even in youth.

• Young Dragon: Upon reaching 5th level, you become a Young Dragon. Your body matures and strengthens: your wings carry you farther and faster, your breath weapon intensifies, and you develop the instinctive ability to weave multiple attacks into a seamless flow of combat.

• Adult Dragon: At 11th level, you ascend to the rank of an Adult Dragon. You grow considerably in size and power, your presence becoming undeniable. Your breath weapon reaches devastating force, your physical prowess peaks, and you gain mastery over the magic and might of your kind.

Dragons do not perish from old age. Without intervention, a dragon will live forever, growing in strength and wisdom across the ages. The only dragons who fail to reach their full potential are those struck down by fate, rivals, or the endless ambitions of the mortal world.

Some—like Dromadus, the Living Mountain—have lived for millennia, becoming legends who rival even the gods. Others—like Celebrant the Just—take the crown of Dragon King by force, their reigns marked by blood and dominance.

To be a dragon is to be timeless. Your greatest enemy is not age, but the blade, the spell, or the trap that would end your story before it is fully written.