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False Hydra 5e Homebrew

Huge Aberration, Chaotic Evil

At a Glance

CR
varies (8-15)
Type
Aberration
Size
Huge
Alignment
Chaotic Evil
AC
15
HP
200 (16d12 + 96)
Speed20 ft., burrow 30 ft.

Jump to

Ability ScoresKey AbilitiesTacticsEncounter TipsCommon MistakesDM TipsFAQSources

Ability Scores

str
20
+5
dex
8
-1
con
18
+4
int
16
+3
wis
14
+2
cha
20
+5

Key Abilities

AbilityDescription
Memory Erasing SongAll creatures within 120 feet that can hear it forget the hydra exists. Those who save (DC 18 Wis) are immune for 24 hours.
Multiple HeadsStarts with 3 heads. Each head can attack independently. If a head is destroyed, two grow back in 1d4 days.
Blind StrikeCreatures under song effect cannot see or target the hydra, but feel unexplained terror.
Town DevourerEmerges at night to consume townspeople. Citizens forget the missing ever existed.

How to Run This Monster

Remain hidden underground. Sing constantly. Emerge only to feed at night. Party must deduce its existence from clues.

Encounter Ideas

This is a mystery horror monster. Players discover empty houses, extra chairs at tables, and feel watched.

Loot
Personal effects of victims (jewelry, weapons), partially digested magic items (DM choice, 1d4 items).

Common Mistakes

Common Mistake
Revealing the monster too early—mystery is everything
Common Mistake
Not preparing enough environmental clues

DM Tips

DM Tip
Use detailed town NPC list, secretly cross off victims session by session
DM Tip
Have NPCs reference people who don't exist anymore

Frequently Asked Questions

Sources & Further Reading