Stygian Swimmer
The hydroloth ignores difficult terrain caused by water, mud, sludge, and swamp growth.
Hydroloth 5e reference with CR 9, type, stat block details, token resources, terrain tools, fear hooks, and monster hunt generation.
A hydroloth is an amphibious yugoloth assassin, a fiendish hunter that drags prey into water, strikes with poisoned jaws, and vanishes through infernal teleportation.
Quick 5e Answer
Hydroloth is a CR 9 fiend for D&D 5e. This page includes AC 17, HP 152 (16d8 + 80), a ready stat block, a downloadable PDF, and connected encounter tools.
Original 5e-Compatible Stat Block
Medium, Fiend (Yugoloth), Neutral Evil
This is an original Monster Almanac 5e-compatible stat block, not an official SRD stat block.
The hydroloth ignores difficult terrain caused by water, mud, sludge, and swamp growth.
A creature damaged by the hydroloth's Psychic damage has Disadvantage on its next Intelligence saving throw before the end of its next turn.
The hydroloth makes two Claw attacks and one Drowning Gaze attack.
Melee Attack Roll: +8, reach 5 ft. Hit: 16 (2d10 + 5) Slashing damage plus 9 (2d8) Acid damage.
Ranged Spell Attack: +7, range 90 ft. Hit: 27 (6d8) Psychic damage.
Intelligence Saving Throw: creatures in a 30-foot Cone. Failure: 45 (10d8) Psychic damage and the target cannot take Reactions until the end of its next turn. Success: Half damage.
Base + optional customizer
Base + optional customizer
Base + optional customizer
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Hydroloth 5e reference: CR 9 fiend, AC 17, HP 152 (16d8 + 80), PDF sheet, token, portrait, terrain, fear hooks, and hunt tools for Extraplanar, Swamp,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 Hydroloth into a focused hunt.
Hydroloth can be used in Extraplanar, Swamp, Coastal when you want a CR 9 fiend that helps shape combat pressure, exploration tension, or narrative danger.
Hydroloth 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 Hydroloth 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.
Hydroloth is listed in Monster Almanac as a CR 9 fiend.
Hydroloth is listed as a fiend.
Yes. This page includes a original 5e-compatible stat block and a downloadable PDF sheet.
Yes. This page links to Hydroloth token, portrait, chatbot, terrain, fear hook, and monster hunt tools for fast D&D prep.
After choosing Hydroloth, 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.