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Terros, The Ancient Grey Dragon - AI-generated fantasy Monster

Terros, The Ancient Grey Dragon

According to draconic myth, Tiamat did not create Terros. She found him sleeping beneath the first mountains, older than the mortal world and bound beneath layers of primordial stone. Their union produced a terrible lineage whose descendants inherited the black dragon's cruelty, the white dragon's predatory savagery, and Terros's dominion over ruin. Terros claims the black and white dragons as his children, though many reject his authority. He seeks to gather every dragon descended from those broods and forge them into a single army for Tiamat.

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GargantuanDragon(Dragon)CR Challenge 20Chaotic Evil

Terros, The Ancient Grey Dragon

Ancient dragonGrey dragonChromatic dragonTiamatSiege monsterLair bossEarth and dustSolo encounterMythic villain
HP367AC22, natural armorSPD40 ft., burrow 40 ft., climb 40 ft., fly 80 ft.CR20 (25,000 XP)DeceptionIntimidationPerceptionStealth
STR
27
DEX
18
save
CON
25
save
INT
16
WIS
20
save
CHA
21
save
Ancient Grey Dragon. Terros can breathe air and water. He has advantage on saving throws against being poisoned, and he has resistance to damage from spells.
Legendary Resistance. If Terros fails a saving throw, he can choose to succeed instead. He can use this trait three times per day.
Magic Weapons. Terros's weapon attacks are magical. When Terros hits with any weapon, the weapon deals an extra bludgeoning damage, included in the attacks below.
Stone Burrower. Terros can burrow through nonmagical, unworked earth and stone. While doing so, he doesn't disturb the material he moves through.
Frightful Presence. Any creature of Terros's choice that is within 120 feet of him and aware of him must succeed on a Wisdom saving throw or become frightened for 1 minute. A frightened creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
Siege Monster. Terros deals double damage to objects and structures.
Stone-Wrapped Magic. Terros has advantage on saving throws against spells and other magical effects. In addition, he has resistance to damage from spells.
Multiattack. The dragon makes one Bite attack and two Claw attacks, or uses Fracturing Breath.
Bite. Melee Weapon Attack: to hit, reach 15 ft., one target. Hit: 19 () piercing damage plus 9 () bludgeoning damage. If the target is a Large or smaller creature, it is grappled, escape . Until this grapple ends, the target is restrained, and Terros can't use his Bite attack against another target.
Claw. Melee Weapon Attack: to hit, reach 10 ft., one target. Hit: 15 () slashing damage.
Tail. Melee Weapon Attack: to hit, reach 20 ft., one target. Hit: 17 () bludgeoning damage. If the target is a Huge or smaller creature, it must succeed on a Strength saving throw or be knocked prone.
Fracturing Breath. Terros exhales a storm of grey dust and razor-edged stone in a 90-foot cone. Each creature in that area must make a Dexterity saving throw, taking 72 () bludgeoning damage on a failed save, or half as much damage on a successful one. A creature that fails the save is also blinded until the end of its next turn. Nonmagical objects and structures in the area take the damage automatically. Terros can't use Fracturing Breath again until he recharges it by rolling a 5 or 6 at the start of his turn.
Wing Attack. Terros beats his wings. Each creature within 15 feet of him must succeed on a Dexterity saving throw or take 17 () bludgeoning damage and be knocked prone. Terros can then fly up to half his flying speed.
Stone-Shedding Hide. When Terros is hit by an attack, he adds 5 to his AC against that attack, potentially causing it to miss. Terros must see the attacker to use this reaction.
Detect. Terros makes one Tail attack or moves up to half his speed without provoking opportunity attacks.
Tail Attack. Terros makes one Tail attack.
Wing Buffet (Costs 2 Actions). Terros beats his wings, using Wing Attack without needing to expend his action.
Rending Ground (Costs 2 Actions). Terros causes a point he can see within 120 feet to crack open. Each creature within 10 feet of that point must succeed on a Dexterity saving throw or take 10 () bludgeoning damage and fall prone. The area becomes difficult terrain until the end of Terros's next turn.
Ancient Cataclysm (Costs 3 Actions). Terros uses Fracturing Breath if it is available. If it is not available, he makes one Bite attack and one Claw attack.
Cantrips
Minor IllusionIllusion— Terros can cast this spell at will without material components, using Charisma as his spellcasting ability. He uses it to manipulate dust, create cover, or disguise the approach of his lair.
6th level
Investiture of WindTransmutation— Terros can cast this spell once per day, requiring no material components. He commonly uses it to create a deadly sandstorm or obscure an entire battlefield.
9th level
EarthquakeTransmutation— Terros can cast this spell once per day, requiring no material components. He uses it to bring down structures, reshape tunnels, and trap fleeing enemies.
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