Indeed.
Living creatures who are slain by spectral clouds become small spectral clouds—only real giants killed by energy-draining attacks can actually become true spectral clouds. Spectral clouds formed in this manner can assume either the gaseous humanoid or cloudlike form of their creator, but they lack the telekinetic ability given below. These imitations are under the control of their slayer as half-strength spectral clouds, inflicting 1-8 hp damage per attack. If their slayer and master is destroyed, they become free-willed undead monsters in their own right.
Create Spawn (Su): Any giant slain by a spectral cloud's energy drain attack becomes a spectral cloud in 1d4 rounds. Any humanoid slain by a spectral cloud becomes a lesser spectral cloud (see below) in 1d4 rounds. Spawn are under the command of the spectral cloud that created them and remain enslaved until its death. They do not possess any of the abilities they had in life.
Lesser Spectral Cloud
Medium Undead (Air)
Hit Dice: xd12+x (x hp)
Initiative: +1
Speed: 50 ft. (10 squares)
Armor Class: 17 (+1 Dex, +6 natural), touch 11, flat-footed 16
Base Attack/Grapple: +x/+x
Attack: Chilling touch +x melee touch (1d8 plus energy drain)
Full Attack: Chilling touch +x melee touch (1d8 plus energy drain)
Space/Reach: 5 ft./5 ft.
Special Attacks: Energy drain, engulfing fog
Special Qualities: Cloudform, damage reduction 15/magic, darkvision 60 ft., gaseous form, low-light vision, unholy toughness
Saves: Fort +x, Ref +x, Will +x
Abilities: Str 11, Dex 13, Con —, Int 13, Wis 16, Cha 17
Skills: x
Feats: x
Environment: Temperate mountains
Organization: Solitary or pair
Challenge Rating: x
Treasure: Standard
Alignment: Usually neutral evil
Advancement: By character class
Level Adjustment: —