Adult Gem Dragon

Physiology

Draconian

Size

Giant

Speed

40 ft., fly 80 ft., burrow 20 ft.

Armor class

21 (dragon scale)

Hit points

229 (17d12 + 119)

Proficiency

+5

• STR 25 +7 save +7
• DEX 8 -1 save +4
• CON 25 +7 save +12
• INT 16 +3 save +3
• WIS 14 +2 save +7
• CHA 21 +5 save +10

Skills

Perception +7 , Stealth +4 , Athletics +12

Passive Perception

17

Senses

blindsight 60 ft., darkvision 120 ft.

Languages

Common, Draconic, Dwarvish

Damage resistances

force

Found in

Subterranean

Spells

Channels with WIS. Save DC 15, spell attack +7 .

Raises stone with Earth-Rifting, and fights from behind the walls it makes.

• At will Pebble , Bulwark
• 3/day each Berm , Rampart
• 1/day each Boulder

Traits

• Frightful Presence

  Each hostile creature within 60 feet that can see the dragon makes a Wisdom saving throw against its save DC or is Frightened for 1 minute.

• Legendary Resistance

  Twice per day, when it fails a saving throw, it may choose to succeed instead.

• Gemstone Hide

  A critical hit against it counts as a normal hit.

Actions

• Multiattack

  The dragon uses Frightful Presence, then makes one Bite attack and two Claw attacks.

• Bite

  +12 to hit · reach 10 ft.

  2d10 + 7 piercing damage

  A bite from the dragon's jaws.

• Claw

  +12 to hit · reach 5 ft.

  2d6 + 7 slashing damage

  A claw strike from the dragon's forelimb.

• Tail

  +12 to hit · reach 15 ft.

  2d8 + 7 bludgeoning damage

  A strike from the dragon's tail.

• Shard Breath

  DC 20 Dexterity save

  The dragon exhales in a 60-foot cone. Each creature in it makes a Dexterity saving throw, taking 17d6 piercing damage on a failure and half as much on a success. Recharges on a roll of 5 or 6 on a d6 at the start of the dragon's turn.

• Wing Attack Legendary

  DC 20 Dexterity save

  The dragon beats its wings. Each creature within 15 feet makes a Dexterity saving throw, taking 2d6 + 7 bludgeoning damage and falling Prone on a failure. The dragon then flies up to half its speed.