Ancient Sand Wyrm

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Gargantuan Dragon (blue, legendary), Lawful Evil

Armor Class 22 (natural armor)

Hit Points 400 (32d12+192)

Speed 50 ft. fly 80 ft.

STR 30 (+10)

DEX 14 (+2)

CON 26 (+8)

INT 18 (+4)

WIS 15 (+2)

CHA 23 (+6)

Saving Throws Str +16, Con +14, Wis +8, Cha +12

Skills Arcana +10, Deception +11, Perception +12

Damage Resistances lightning; thunder

Damage Immunities electricity

Condition Immunities charmed, frightened

Senses blindsight 60 ft., darkvision 120 ft., passive Perception 22

Languages Common, Draconic, telepathy 120 ft.

Challenge 20 (25,000 XP) Proficiency Bonus +6

Legendary Resistance (3/Day). If the creature fails a saving throw, it can choose to succeed instead.

Magic Resistance. The creature has advantage on saving throws against spells and other magical effects.

Desert Camouflage. The creature has advantage on Dexterity (Stealth) checks made in desert terrain.

Legendary Presence. As a bonus action, the dragon can target one creature it can see within 30 feet of it. The target must succeed on a DC 21 Wisdom saving throw or be frightened for 1 minute.

Actions

Multiattack. The dragon makes three attacks: one with its bite and two with its claws.

Bite. Melee weapon Attack: +12 to hit, reach 15 ft., one target. Hit: 30 (4d10+8) piercing damage.

Claw. Melee weapon Attack: +12 to hit, reach 10 ft., one target. Hit: 15 (2d6+8) slashing damage.

Lightning Breath (Recharge 5-6). The dragon exhales lightning in a 90-foot line that is 5 feet wide. Each creature in that line must make a DC 21 Dexterity saving throw, taking 88 (16d10) lightning damage on a failed save, or half as much damage on a successful one.

Sandstorm. The dragon creates a swirling sandstorm in a 60-foot radius centered on itself for 1 minute. The area is heavily obscured. Creatures entering the area must succeed on a DC 21 Strength saving throw or take 22 (4d10) bludgeoning damage and be knocked prone.

Legendary Actions

The dragon can take 3 legendary actions, choosing from the options below. Only one legendary action can be used at a time and only at the end of another creature's turn. The dragon regains spent legendary actions at the start of its turn.

Detect. The dragon makes a Wisdom (Perception) check.

Wing Attack (Costs 2 Actions). The dragon beats its wings. Each creature within 15 feet must succeed on a DC 21 Dexterity saving throw or take 26 (4d6 + 8) bludgeoning damage and be knocked prone.

Shadow of the Wyrm (Costs 2 Actions). The dragon can teleport up to 120 ft. to an unoccupied space it can see.

Lair

Lair Actions

On initiative count 20 (losing initiative ties), the creature can take a lair action to cause one of the following effects; it can't use the same effect two rounds in a row:

Sand Quake. On initiative count 20 (losing initiative ties), the dragon can cause the ground to tremble in a 60-foot radius. Each creature in that area must succeed on a DC 21 Dexterity saving throw or fall prone.
Electrifying Surge. On initiative count 20, the dragon can deal 22 (4d10) lightning damage to a target in its lair.

Regional Effects

The region containing the creature's lair is warped by its magic, creating the following effects:

Sandstorms occur frequently within 6 miles of the lair, reducing visibility to 10 feet.
Creatures that die in the desert around the lair rise as skeletal guardians bound to the dragon's will.
Any water sources within 1 mile of the lair are magically drained, rendering them dry.

If the dragon is slain, these effects fade over the course of 1d10 days.

Environment Desert

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Lore & Description

Appearance

The Ancient Sand Wyrm is a massive blue dragon that shimmers like a mirage in the scorching sun. Its scales glisten in hues of azure and gold, reminiscent of the desert sands. The creature's eyes sparkle with malevolence, and its elongated body is adorned with spikes that resemble jagged dunes.

Behavior & Origins

Revered and feared as a god by desert tribes, the Ancient Sand Wyrm possesses a cunning intellect and commands respect through sheer power. It often collects tributes from neighboring settlements and uses its fearsome reputation to bend weaker minds to its will. The dragon lairs beneath the surface, where it guards treasures of ancient civilizations and artifacts that wield powerful magic.

Monster Image

Generation Info

Original prompt:
"An ancient blue dragon of the desert"

Created: Jan 28, 2026
Modified: May 31, 2026