Prestige 2:

Shadow Talon - Your stealth has become supernaturally enhanced by your innate draconic powers. You are always hiding (as in the hide action), and only creatures or objects with blindsight that can beat your stealth can see or detect you. When you take the hide action, you instantly become invisible, and any sounds, movements, or other traces of your presence are erased. Once per round, when you fail a saving throw, you may make a hide check against the save DC to hide from the effect, therefore ignoring it as if you weren’t targeted or in range

Flames of the Vengeance- Your attacks are empowered by your own draconic essence. You always attack against an AC of 10 for all enemies. When you hit with a ranged weapon all hostile targets within 20 ft of where your attack hit (including the ground or surface) must make a dexterity save against your attack roll total, taking the total damage on a failure, half on a success. 

Prestige 4:

True Dragon - You may transform into a Crystal Greatwyrm as an action. Your stats and abilities change to match the dragon, but your mental scores remain the same. If you were to be reduced to 0 in this form, you become unconscious and make death save as normal. Your weapons become integrated into this form, merging into it. You may make weapon attacks in this form as your weapons and their abilities have been imbued into your draconic form. You still must obey any ability recharging requirements while in this form. Lastly, you may alter your size from your normal humanoid size to full greatrym size, depending on your needs, as a free action. 

Destroyer’s Fury - Your attacks emit potent bursts of draconic force that remove obstacles. Your attacks instantly destroy any constructs of force, barriers, or other forms of cover. Any damage you deal is dealt directly to a creature's hit points regardless of any barriers, temporary hit points, and other forms of non-maximum hit point damage absorption a creature may have. Any subsequent attacks against any creature within 24 hours treat it as if it lacks any absorptions, immunities, and resistance to your damage. Your rage prevents your powers from being stolen suppressed, copied, or negated.

Prestige 6

Shadow Egg -Whenever you reduce a creature to zero hitpoints, that creature becomes enveloped in a shadowy egg before any awakening, death ward, or other replacement effects may occur. Any creature enveloped in this egg may be transported to your domain as a free action. While inside the egg, the creature is unconscious and unable to act until you will it. Creatures sealed within eggs do not age as their bodies are kept in perfect stasis. You may release any creature bound this way with a free action. You may also transport any willing creatures to your domain this way.

Wyrmcall - As an action, you may call upon the full wrath of your brood to smite your foes. You call forth four Ancient Gem Dragons (your choice of Gem). These dragons last until they are killed or dismissed. Once you use this ability, you must wait 1d4 days before you can use it again. Any ancient dragons remaining when this ability is used again are replaced by fresh members of your brood.

Prestige 8:

Brood of the Destroyer - As an action, you may call forth a number of gem greatwyrms (your choice of type) equal to your dexterity modifier. Damage that would be dealt to you is instead dealt to the greatwyrms as they seek to protect their brood mother. Whenever you fail a save, these wyrms may expend their legendary resistances to ensure you pass.

Unseen Presence - Creatures cannot target you with hostile abilities, effects, spells, or attacks unless you wish to be. You may teleport to any part of your domain as a free action. You also know every creature's thoughts, emotions, and locations while they are within your domain. You are always considered within range to strike at any creature within your domain.