Abilities

Draconic Armor (Level 1): +1 to natural armor class
Draconic Ability Scores (Level 2): gains +2 to Strength
Breath Weapon I (Level 3): can use the breath weapon of a red dragon, doing 2d10 points of damage.
Draconic Ability Scores (Level 4): gains +2 to Strength
Hit Dice d8 (Level 4): now gains d8 hit-points per level.
Draconic Armor (Level 5): +2 to natural armor class
Hit Dice d10 (Level 6): now gains d10 hit-points per level.
Draconic Ability Scores (Level 7): gains +2 to Constitution
Breath Weapon II (Level 7): can use the breath weapon of a red dragon, doing 4d10 points of damage.
Draconic Armor (Level 8): +3 to natural armor class
Draconic Ability Scores (Level 9): gains +2 to Intelligence
Wings (Level 9): the red dragon disciple gains wings.
Half-Dragon (Level 10): becomes a half-dragon. Gains darkvision and immunity to sleep, paralysis and fire.
Draconic Ability Scores (Level 10): gains +4 to Strength, +2 to Charisma
Draconic Armor (Level 10): +4 to natural armor class
Breath Weapon III (Level 10): can use the breath weapon of a red dragon, doing 6d10 points of damage.

Red Dragon Disciple - Epic Levels (level 21+)

Embracing his draconic heritage is but one stop on the disciple's life journey. His quest to understand, command, and harness his draconic energies has taken him into the realm of the epic.
Hit Die: d12
Skill Points: 2 + Int Modifier every level
Bonus Feats: 1 bonus feat every four levels
Breath Weapon: Your breath weapon damage potential increases by 1d10 for every 3 levels after 10th. The save DC against your breath weapon increases by +1 every 4 levels after 10th.

Epic Red Dragon Disciple Bonus Feats List

Armor Skin, Automatic Quicken Spell, Automatic Silent Spell, Automatic Still Spell, Damage Reduction, Epic Reputation, Epic Spell Focus, Epic Prowess, Epic Spell Penetration, Epic Toughness, Improved Combat Casting.