Create Greater Undead

Create Greater Undead
(Player's Handbook v.3.5, p. 215)

Necromancy [Evil]
Components: V, S, M,
Casting Time: 1 hour
Range: Close (25 ft. + 5 ft./2 levels)
Target: One corpse
Duration: Instantaneous
Saving Throw: None
Spell Resistance: No

This spell functions like create undead, except that you can create more powerful and intelligent sorts of undead: shadows, wraiths, spectres, and devourers (see the Monster Manual for more information on all types of undead). The type or types of undead you can create is based on your caster level, as shown on the table below.
Caster Level Undead Created
15th or lower Shadow
16th—17th Wraith
18th—19th Spectre
20th or higher Devourer