Gem Awakening (Recharges after a Short or Long Rest). If the greatwyrm would be reduced to 0 hit points, its current hit point total instead resets to 400 hit points, it recharges its Breath Weapon, and it regains any expended uses of Legendary Resistance. Additionally, the greatwyrm can now use its Mass Telekinesis action during the next hour. Award a party an additional 90,000 XP (180,000 XP total) for defeating the greatwyrm after its Gem Awakening activates.
Legendary Resistance (4/Day). If the greatwyrm fails a saving throw, it can choose to succeed instead.
Unusual Nature. The greatwyrm doesn’t require food or drink.
Multiattack. The greatwyrm makes one Bite attack and two Claw attacks.
Bite. Melee Weapon Attack: +17 to hit, reach 15 ft., one target. Hit: 20 (2d10 + 9) piercing damage plus 16 (3d10) force damage.
Claw. Melee Weapon Attack: +17 to hit, reach 10 ft., one target. Hit: 18 (2d8 + 9) slashing damage. If the target is a Huge or smaller creature, it is grappled (escape DC 19) and is restrained until this grapple ends. The greatwyrm can have only one creature grappled in this way at a time.
Breath Weapon (Recharge 5–6). The greatwyrm exhales crushing force in a 300-foot cone. Each creature in that area must make a DC 25 Dexterity saving throw. On a failed save, the creature takes 71 (11d12) force damage and is knocked prone. On a successful save, it takes half as much damage and isn’t knocked prone. On a success or failure, the creature’s speed becomes 0 until the end of its next turn.
Mass Telekinesis (Gem Awakening Only; Recharges after a Short or Long Rest). The greatwyrm targets any number of creatures and objects it can see within 120 feet of it. No one target can weigh more than 4,000 pounds, and objects can’t be targeted if they’re being worn or carried. Each targeted creature must succeed on a DC 26 Strength saving throw or be restrained in the greatwyrm’s telekinetic grip. At the end of a creature’s turn, it can repeat the saving throw, ending the effect on itself on a success.
At the end of the greatwyrm’s turn, it can move each creature or object it has in its telekinetic grip up to 60 feet in any direction, but not beyond 120 feet of itself. In addition, it can choose any number of creatures restrained in this way and deal 45 (7d12) force damage to each of them.
Spellcasting (Psionics). The greatwyrm casts one of the following spells, requiring no spell components and using Intelligence as the spellcasting ability (spell save DC 26, +18 to hit with spell attack):
6/day each: protection from evil and good, magic missile, earth tremor
5/day each: dispel magic, blink, erupting earth,
4/day each: freedom of movement, control water
3/day each: globe of invulnerability
2/day each: reverse gravity, forcecage, plane shift, move earth, bones of the earth
1/day each: time stop, earthquake
Change Shape. The greatwyrm magically transforms into any creature that is Medium or Small, while retaining its game statistics (other than its size). This transformation ends if the greatwyrm is reduced to 0 hit points or uses a bonus action to end it.
Psychic Step. The greatwyrm magically teleports to an unoccupied space it can see within 60 feet of it.
The greatwyrm can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature’s turn. The greatwyrm regains spent legendary actions at the start of its turn.
Claw. The greatwyrm makes one Claw attack.
Psionics (Costs 2 Actions). The greatwyrm uses Psychic Step or Spellcasting.
Psychic Beam (Costs 3 Actions). The greatwyrm emits a beam of psychic energy in a 90-foot line that is 10 feet wide. Each creature in that area must make a DC 26 Intelligence saving throw, taking 27 (5d10) psychic damage on a failed save, or half as much damage on a successful one.
Description
More so even than their chromatic and metallic kin, gem dragons are fascinated with cultivating their dragonsight and fusing the awareness of their echoes across the Material Plane. Some of them believe that, by doing so, they are taking steps toward reuniting the shattered consciousness of Sardior the Ruby Dragon, and they pursue this awakening as an act of near-religious devotion. Others seek to exploit their knowledge of the many worlds of the Material Plane as a source of power—and indeed, a gem dragon who becomes a greatwyrm has access to almost unimaginable power.
Gem greatwyrms’ ascension transforms their bodies to appear as crystal, their scales sparkling like diamonds. Their breath weapons become powerful waves of crushing force that can stop almost any creature in its tracks. But the greatwyrms’ most powerful ability is telekinesis on an unparalleled scale—a gem greatwyrm can telekinetically seize an entire crowd, then carry those helpless folk off to the dragon’s lair.
SARDIOR’S GREATWYRMS
Five gem greatwyrms call themselves the thanes of Sardior and believe themselves responsible for preserving the memory of their long-lost progenitor. These greatwyrms are named Aleithilithos (an amethyst greatwyrm), Hrodel (a crystal greatwyrm), Smargad (an emerald greatwyrm), Charsima (a sapphire greatwyrm), and Tithonnas (a topaz greatwyrm). Each thane is actively seeking out their echoes across the worlds of the Material Plane, hoping to merge with these other dragons, with the goal of eventually uniting themselves to re-form the great Ruby Dragon.
Lair and Lair Actions
An Amethyst Dragon’s Lair
Amethyst dragons make their lairs in caves next to or under secluded pools and lakes, preferring caverns with at least one entrance submerged underwater. They prize locations with a combination of open space, connecting tunnels, and dead ends to make the most of their natural and magical mobility, using flight and teleportation to navigate obstacles in their lairs.
The challenge rating of a legendary amethyst dragon increases by 1 when it’s encountered in its lair.
Lair Actions
On initiative count 20 (losing initiative ties), the dragon can take one of the following lair actions; the dragon can’t take the same lair action two rounds in a row:
Beguiling Whisper. The dragon telepathically whispers to one creature within range of the dragon’s telepathy. The creature must succeed on a DC 15 Wisdom saving throw or be charmed by the dragon until initiative count 20 on the next round. A creature charmed in this way obeys to the best of its ability any command the dragon issues that isn’t directly harmful to the creature.
Imprisoning Force. The dragon casts the forcecage spell, using its spell save DC and requiring no spell components. The spell ends early if the dragon uses this lair action again or dies.
Spatial Projection. The dragon chooses a space it can fit into within the lair. It exists in its own space and the chosen space simultaneously until initiative count 20 on the next round. Whenever it moves or takes an action, it chooses which version of itself is moving or acting. If an effect or attack can target both of the dragon’s spaces at the same time, the dragon is affected only once.
Regional Effects
The region surrounding a legendary amethyst dragon’s lair is altered by the dragon’s magic, creating one or more of the following effects:
Background Check. Once per day, the dragon can cast the legend lore spell, requiring no spell components, naming any person, place, or object within 1 mile of the lair as the spell’s subject.
Crystal Profusion. Amethyst crystals and geodes form along muddy shores and lake beds within 6 miles of the lair.
Thriving Wildlife. Fish and other aquatic Beasts reproduce rapidly and thrive in bodies of water within 6 miles of the lair. Foraging in these waters yields twice the usual amount of food.
Watery Sight. Water within 6 miles of the lair is a conduit for the dragon’s psionic presence. As an action, the dragon can cast the clairvoyance spell, requiring no spell components and targeting any body of water in that region.
If the dragon dies, the populations of aquatic life near the lair return to normal levels over the course of 1d10 days. The existing abundance of amethysts remains, but new crystals and geodes form at a normal rate.
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