You can channel the necromancy power you hold to briefly bring forth an undead servant.
Prerequisite(s): Ability to cast 4th-level spells, Spell Focus (Necromancy).
BENEFIT
As long as you have a necromancy spell of 4th level or higher in your known spells and have at least 4 MP in your MP pool, you can summon any CR 2 or less undead creature (your choice) within a range of 30 feet. The undead acts as if summoned by a summon undead spell. The duration of the summoning is equal to 1 round per level of the highest-level necromancy spell you can cast. You can have only one summoned undead from this feat at a time; if you use the ability a second time, the first undead disappears. Also, you must remain close to the undead you summon. If at the end of your turn you are more than 30 feet from the undead, it disappears.
If you have a necromancy spell of 6th level or higher available to cast, you can summon any CR 6 or less undead creature (your choice) instead. If you have a necromancy spell of 8th level or higher available to cast, you can summon any CR 8 or less undead creature (your choice) instead.
As a secondary benefit, you gain a +1 competence bonus to your caster level when casting necromancy spells.