Guardian, Gauntlet (CR 4)

Small Construct
Alignment: Always neutral
Initiative: +0
Languages: Cannot speak

AC: 19(+1 size, +1 Dex, +7 natural), touch 12, flat-footed 18
Hit Dice: 4d10+10 (32 hp); DR: 5/-
Fort +1, Ref +2, Will +1
Speed: 20 ft.
Space: 5 ft./5 ft.
Base Attack +3; Grapple +4*
Attack: Slam +9* melee
Full Attack: 2 slams +9* melee
Damage: Slam 1d6+5
Special Attacks/Actions: -
Abilities: Str 20, Dex 12, Con -, Int -, Wis 10, Cha 1
Special Qualities: Construct traits, fast healing 1, find master, spell storing
* Because its a familiar, a gauntlet guardian has the same base attack bonus as its master.
Feats: -
Skills: -
Advancement: 5-8 HD (Small); 9-12 HD (Medium)
Climate/Terrain: Any
Organization: Solitary
Treasure/Possessions: None

Source: Compete Warrior

Find Master (Su): No matter the distance, as long as it is on the same plane, a gauntlet guardian can find its master.

Spell Storing (Sp): A gauntlet guardian can store one spell of 2nd level or lower that is cast into it by another creature. It uses this spell when commanded or when a predetermined situation arises. Once this spell is used, it can store another spell (or the same spell).

Gauntlet guardians aren't exactly subtle. They simply move adjacent to their foes and start pummeling with their immense fists.