Moth, Luna (CR 4)

Large Magical Beast
Alignment: Usually chaotic good
Initiative: +2 (Dex); Senses: darkvision 60 ft., low-light vision, scent, see invisible, Listen +6, and Spot +10

AC: 13 (-1 size, +2 Dex, +2 natural), touch 11, flat-footed 11
Hit Dice: 5d10 (27 hp)
Fort +4, Ref +6, Will +5
Speed: 10 ft., fly 40 ft. (average)
Space: 10 ft./5 ft.
Base Attack +5; Grapple +12
Attack: Slam +7 melee
Full Attack: Slam +7 melee
Damage: Slam 1d4+4
Special Attacks/Actions: Sleep dust
Abilities: Str 16, Dex 15, Con 10, Int 10, Wis 14, Cha 15
Special Qualities: natural invisibility
Feats: Hover, Iron Will
Skills: Hide +0, Listen +6, Move Silently +10, and Spot +10
Advancement: 6-10 HD (Large); 11-15 HD (Huge)
Climate/Terrain: Temperate forests
Organization: Solitary, pair, or cloud (4-7)
Treasure/Possessions: None

Source: Heroes of Battle

Natural Invisibility (Su): A luna moth is invisible except while in direct moonlight. This ability is constant, allowing a luna moth to remain invisible even when attacking. This ability is inherent and not subject to the invisibility purge spell.

See Invisible (Su): A luna moth can see any invisible or ethereal objects or beings within its range of vision, as if they were normally visible.

Sleep Dust (Su): Once per day, a luna moth can release sleep-inducing dust from the underside of its wings, filling a 20-foot-radius spread. This dust causes a magical slumber to come upon 4 Hit Dice worth of creatures within the area (Will DC 14 negates). Its effect is otherwise identical to the sleep spell. The save DC is Charisma-based.

Skills: luna moths have a +4 racial bonus on Move Silently and Spot checks.

Luna moths gain a +4 racial bonus on Hide checks in moonlight. (They are naturally invisible under all other light conditions.)

Luna moths are not great fighters, relying on their natural invisibility and sleep dust to avoid predators and to stalk prey. When forced to fight, luna moths will slam prey with their wings and try to use their sleep dust to neutralize multiple threats.