Slaymate (CR 2)

Small Undead
Alignment: Always lawful evil
Initiative: +1 (Dex); Senses: darkvision 60 ft., Listen +7, and Spot +7
Languages: Common

AC: 16 (+1 Dex, +1 size, +4 natural), touch 12, flat-footed 15
Hit Dice: 4d12 (26 hp)
Fort +1, Ref +4, Will +5
Speed: 20 ft.
Space: 5 ft./5 ft.
Base Attack +2; Grapple -
Attack: Bite +4 melee
Full Attack: Bite +4 melee
Damage: Bite 1d3+1 plus pale wasting
Special Attacks/Actions: Pale wasting disease
Abilities: Str 12, Dex 12, Con -, Int 11, Wis 13, Cha 15
Special Qualities: undead pale aura, undead traits
Feats: Alertness; Lightning Reflexes
Skills: Hide +8, Listen +7, Move Silently +8, and Spot +7
Advancement: 5-8 HD (Small)
Climate/Terrain: Any
Organization: Solitary or pairbond (1 3rd-level necromancer plus 1 slaymate)
Treasure/Possessions: None

Source: Libris Mortis

Pale Aura (Su): A slaymare produces an invisible aura in a 10-foot radius around itself. Any creature within the aura that uses a metamagic feat on a spell from the school of necromancy can prepare or use the spell as if it took up a spell slot one level lower than what the metamagic necromancy spell would normally require.

For instance, if a caster wants to produce an enlarged fear spell, the enlargement would normally require the spellcaster to prepare the spell (or cast it on the fly) as if it were one level higher than it actually is. But, in the radius of a slaymate's pale aura, the caster prepares an enlarged fear spell as if the spell were being cast normally.

Pale Wasting (Su): Supernatural disease - bite, Fortitude DC 14, incubation period 1 day; damage 1d6 Con and 1d6 Str. The save DC is Charisma-based

Slaymates, when forced to fight, have a disease-laden bite.

Slaymates are undead creatures given a semblance of life when a guardian's betrayal, either outright or through negligence, leads to death. A slaymate's appearance is a weird and twisted reflection of the form it had in life. Slaymates are highly prized by necromancers, and thus are rarely encountered alone but instead are found in the presence of evil spellcasters and others who dabble in necromancy. Many a slaymate can be found riding, papoose style, on the back of a necromancer who values the slaymate's special abilities.

A slaymate is about the height and weight of an eight-year-old human child.