Lord of Tides
The dragon ignores difficult terrain caused by water, surf, kelp, mud, and ship debris.
Adult Sea Dragon 5e reference with CR 18, type, stat block details, token resources, terrain tools, fear hooks, and monster hunt generation.
An adult sea dragon is a huge marine dragon of depth and storm, a third-party inclusion under tolerance level 1.
Quick 5e Answer
Adult Sea Dragon is a CR 18 dragon for D&D 5e. This page includes AC 20, HP 287 (23d12 + 138), a ready stat block, a downloadable PDF, and connected encounter tools.
Original 5e-Compatible Stat Block
Huge, Dragon, Neutral
This is an original Monster Almanac 5e-compatible stat block, not an official SRD stat block.
The dragon ignores difficult terrain caused by water, surf, kelp, mud, and ship debris.
Creatures Grappled by the dragon cannot regain Hit Points and have Disadvantage on Strength saving throws.
The dragon makes three attacks: Bite and two Claws.
Melee Attack Roll: +15, reach 15 ft. Hit: 35 (4d12 + 9) Piercing damage plus 22 (5d8) Cold damage.
Melee Attack Roll: +15, reach 10 ft. Hit: 16 (2d6 + 9) Slashing damage.
Strength Saving Throw: creatures in a 60-foot Cone. Failure: 108 (24d8) Bludgeoning and Cold damage, split evenly, and the target is pushed 30 feet. Success: Half damage.
When missed by an attack, the dragon swims or flies up to 20 feet without provoking Opportunity Attacks.
Base + optional customizer
Base + optional customizer
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Adult Sea Dragon 5e reference: CR 18 dragon, AC 20, HP 287 (23d12 + 138), PDF sheet, token, portrait, terrain, fear hooks, and hunt tools for Ocean,β¦ This page is part of the complete Monster Almanac stat block library. It includes a original 5e-compatible stat block with a downloadable PDF sheet, plus connected prep tools. Use this Monster Almanac page to move from search result to table prep: read the quick 5e reference, open the stat block, download the PDF when available, generate a token or portrait prompt, build matching terrain, create a monster-bound fear hook, and turn Adult Sea Dragon into a focused hunt.
Adult Sea Dragon can be used in Ocean, Coastal, Wilderness when you want a CR 18 dragon that helps shape combat pressure, exploration tension, or narrative danger.
Adult Sea Dragon works well as a supporting threat, recurring danger, or encounter-building piece inside a larger scene.
The attached original 5e-compatible stat block gives you a table-ready rules reference, and the PDF button keeps the sheet easy to print or save before the session.
This makes Adult Sea Dragon useful not only as a monster reference, but also as a scene-shaping piece for travel danger, dungeon pressure, wilderness discovery, or a stronger narrative threat.
Adult Sea Dragon is listed in Monster Almanac as a CR 18 dragon.
Adult Sea Dragon is listed as a dragon.
Yes. This page includes a original 5e-compatible stat block and a downloadable PDF sheet.
Yes. This page links to Adult Sea Dragon token, portrait, chatbot, terrain, fear hook, and monster hunt tools for fast D&D prep.
After choosing Adult Sea Dragon, the next step is usually to connect the monster with a place, an encounter shape, a supporting cast, or a character who fears it. Use the tools below to keep building without leaving the Monster Almanac workflow.