This creature appears to be an animated skeleton whose bones have been coated with metal.
Lead Skeleton CR 7
Speed 30 ft.
Melee 2 slams +16 (1d8+6)
Str 22, Dex 18, Con –, Int –, Wis 10, Cha 1
Base Atk +10; CMB +16; CMD 30
Immunity to Magic (Ex)
A lead skeleton is immune to any spell or spell-like ability that allows spell resistance. In addition, certain spells and effects function differently against the creature, as noted below.
A magical attack that deals sonic damage slows a lead skeleton (as the slow spell) for 1d4 rounds, with no saving throw.
Organization solitary or group (2-6)
Treasure no coins, double goods (gems only), no items
Lead skeletons appear as 6-foot tall skeletons constructed of metal. Some have gemstones encrusted in the body and eye sockets. A lead skeleton is expensive to create. Those who choose to create such creatures prefer the added fear and awe the skeletons tend to receive, and have a great deal of additional wealth and time.
Lead skeletons can be programmed to attack only certain creatures or be programmed to accept certain passwords or types of clothing. More complex programming tends to fail. While lead skeletons might not have the same abilities as other golems, their immunities and speed make them extraordinarily dangerous. They use their fists to inflict large amounts of damage and attack a single target until it is dead.
Lead Skeleton Construction
Bones from a full humanoid skeleton are carefully sheathed in an alloy of lead and iron and rejoined with iron or steel hinges. The total cost of the body must be at least 2,000 gp. An elemental spirit is summoned during the creation and bound to the body. To bind the elemental spirit, the creator must summon and confine an elemental using any of the planar binding spells.
CL 14th; Price 41,000 gp
Feats Craft Construct; Spells geas/quest, limited wish, polymorph any object, resist energy (fire, cold, electricity, acid), planar binding (any), caster must be at least 14th level; Skill Check(s) Craft (armor) DC 16 or Craft (weapons) DC 16; Cost 21,500 gp
Lead Skeleton from the Tome of Horrors Complete, Copyright 2011, Necromancer Games, Inc., published and distributed by Frog God Games; Authors Patrick Lawinger and Scott Greene.