Fen Hydra
Large natural beast (reptile)
Level 12 Solo Brute XP 3500

Initiative +9        Senses Perception +13; all-around vision
HP 620; Bloodied 310
AC 25; Fortitude 26, Reflex 24, Will 23
Saving Throws +5
Speed 5, swim 10
Action Points 2

(⚔) Bite (standard, at-will)

Reach 2; +14 vs AC; 1d8+5 damage.

⚔ Hydra Fury (standard, at-will)

The fen hydra makes four bite attacks.

Many-Headed

Each time the fen hydra becomes dazed or stunned, it loses one attack on its next turn instead. Multiple such effects stack.

Threatening Reach

The fen hydra can make opportunity attacks against all enemies within its reach (2 squares).

Alignment Unaligned        Languages -
Skills Stealth +14
Str 20 (+11)      Dex 16 (+9)      Wis 14 (+8)
Con 20 (+11)      Int 2 (+2)      Cha 8 (+5)

Published in Monster Manual, page(s) 164.