Guardian, Blade (CR 6)

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

AC: 20 (+10 natural), touch 10, flat-footed 20
Hit Dice: 8d10+20 (64 hp); DR: 5/-
Fort +2, Ref +2, Will +2
Speed: 20 ft.
Space: 5 ft./5 ft.
Base Attack +6; Grapple +13
Attack: Claw +13 melee*
Full Attack: 2 claws +13* melee
Damage: Claw 1d6+7
Special Attacks/Actions: -
Abilities: Str 24, Dex 10, Con -, Int -, Wis 10, Cha 1
Special Qualities: Construct traits, fast healing 1, find master, guard, spell storing
*Because its usually a familiar, a blade guardian has the same base attack bonus as its master.
Feats: -
Skills: -
Advancement: 9-13 HD (Medium); 14-24 HD (Large)
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 blade guardian can find its master.

Guard (Ex): A blade guardian moves swiftly to defend its master by its side, blocking blows and disrupting foes. All attacks against the master take a -2 penalty if the blade guardian is adjacent.

Spell Storing (Sp): A blade guardian can store one spell of 3rd 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).

Blade guardians are relentless combatants, striking at foes with their whirling blade-arms and rarely straying far from their masters.