Huge elemental beast (reptile)
Level 22 Solo Brute XP 20750
Initiative +16 Senses Perception +20; all-around vision
HP 848; Bloodied 424
AC 34; Fortitude 36, Reflex 32, Will 31
Resist 20 variable (2/encounter)
Saving Throws +5
Action Points 2
Frostfire Bite (standard, at-will) Cold, Fire
Reach 3; +25 vs AC; 3d8+5 cold and fire damage.
Storm Bite (standard, at-will) Lightning, Thunder
Reach 3; +25 vs AC; 3d8+5 lightning and thunder damage.
Hydra Fury (standard, at-will)
The chaos hydra makes a storm bite attack, a frostfire bite attack, and each additional attack it has gained through the growth of a head.
Crushing Maw (standard, at-will)
Reach 3; +25 vs AC; 1d8+5 damage, and the target is slowed and takes ongoing 10 damage (save ends both).
Mind Bite (standard, at-will)
Reach 3; +25 vs AC; 1d8+5 damage, and the target is dazed (save ends).
Paralyzing Fang (standard, at-will)
Reach 3; +25 vs AC; 1d8+5 damage, and the target is immobilized and takes a -2 penalty to all defenses (save ends both).
Venom Tooth (standard, at-will) Poison
Reach 3; +25 vs AC; 1d8+5 damage, and ongoing 10 poison damage (save ends).
A chaos hydra starts with two heads. When the hydra first reaches 636, 424, and 212 hit points, it grows an additional head. Roll a d4 at each increment to determine which attack the new head makes:
1—Crushing Maw, 2—Mind Bite, 3—Paralyzing Fang, or 4—Venom Tooth. A hydra can gain the same attack multiple times through this effect.
Each time a chaos hydra would become dazed or stunned, it instead loses one attack, determined randomly, while using hydra fury during its next turn. The hydra can be dazed or stunned multiple times.
A chaos hydra can make opportunity attacks against all enemies within its reach (3 squares).
Alignment Chaotic evil Languages -
Str 26 (+19) Dex 20 (+16) Wis 19 (+15)
Con 28 (+20) Int 2 (+7) Cha 10 (+11)
Published in Monster Manual 2, page(s) 150.