Iron Cobra
Small Construct
Hit Dice: 1d10 (5 hp)
Initiative: +1 (Dex)
Speed: 40 ft.
AC: 20 (+1 size, +1 Dex, +8 natural)
Attacks: Bite +1 melee
Damage: bite 1d3
Face/Reach: 5 ft. by 5 ft./5 ft.
Special Attacks: Poisoned bite
Special Qualities: Darkvision 60 ft., damage reduction 5/+1, darkvision immunity, web immunity, silent stalk, save bonus
Saves: Fort +0, Ref +1, Will -5
Abilities: Str 11, Dex 12, Con --, Int --, Wis 1, Cha 1
Skills: Hide +18*
Feats: None
Climate/Terrain: Any land
Organization: Solitary
Challenge Rating: 1
Treasure: None
Alignment: Always neutral
Advancement: --

An iron cobra appears somewhat similar to a normal poisonous snake, yet it is a programmable, magical automaton, constructed of an unknown metal by some ancient wizard, or perhaps even a minor paragon.

Combat
     Poisoned Bite (Ex):  Bite, Fortitude save (DC 14); initial 2d6 and secondary 1d6 temporary constitution damage.
     Damage Reduction (Ex): 5/+1
     Construct:  Immune to mind-influencing effects, poison, disease, and similar effects.  Not subject to critical hits, subdual damage, ability damage, energy drain, or death from massive damage.
     Darkvision Immunity (Ex):  Iron cobras emit no body heat, and thus are invisible to darkvision.  
     Web Immunity (Ex):  Iron cobras are immune to the effects of webs (natural or magical).  
     Silent Stalk (Su):  Once per turn, an iron cobra can move for one round in absolute silence, attempting to move up behind a victim to attack.
     Save Bonus (Ex):  Iron cobra receive a +8 bonus to saves verses magical attacks.
     Skills:  Iron cobras receive a +18 racial bonus to their Hide checks.
     Note:  While most iron cobras were supplied with a deadly poison, other iron cobras were outfitted with paralyzing poison, sleep‑inducing, hypnotic, or other drugs. Regardless of the effect, the fang reservoir holds enough liquid for three injections only. Recharging the fangs would require only two rounds‑if the creator of the iron cobra were present. However, one iron cobra was believed to be able to regenerate the contents of its poison reservoir in 24 hours. 

* Converted by DJBehringer (Archimagus@aol.com)