Jaculus

You see what appears to be a flight of large bats; the membranous wings, the dozens of creatures fluttering in a black cloud’ almost immediately, you realise their bodies are not those of bats – these are winged snakes.

The jaculus darts from the branches of trees; and it is not only to our feet that the serpent is formidable, for these fly through the air even, just as though they were hurled from an engine.”

The jaculus is a small serpent with wings. The jaculus hide in the trees and spring out at there victims. The force of it launching itself at the victim led to the association with javelins. “

Wingvipers are evil flying ophidians, dwelling mostly in damp underground caves. They look like Small serpents, coloured many shades of dark green, with bat-like scaled wings of the same colour. Evil wizards with the Improved Familiar feat may take wingvipers as familiars.

Monster Encyclopaedia II: The Dark Bestiary
Author J. C. Alvarez
Series Monster Encyclopaedia
Publisher Mongoose Publishing
Publish date 2005

Wingviper
Tiny magical beast
Hit Dice	2d10+2 (13 hp)
Initiative	+4
Speed	20 ft. (4 squares), Fly 40 ft. (average)
AC	19 (+2 size, +4 Dexterity, +3 natural), touch 16, flat-footed 15
Base Attack/Grapple	+2/-8
Attack	Bite +8 melee (1d3-2 plus poison)
Full Attack	Bite +8 melee (1d3-2 plus poison)
Space/Reach	2½ ft. /0 ft.
Special Attacks	Poison
Special Qualities	Darkvision 60 ft., Low-Light Vision
Saves	Fort +4, Ref +7, Will +0
Abilities	Strength 6, Dexterity 19, Constitution 12, Intelligence 5, Wisdom 11, Charisma 7
Skills	Listen +5, Spot +5, Swim +1
Feats	Weapon Finesse
Environment	Underground
Organisation	Solitary, clutch (2-12) or flock (11-30)
Challenge Rating	2
Treasure	None
Alignment	Usually neutral evil
Advancement	3-4 HD (Tiny), 5-6 HD (Small)
Level Adjustment	+3 (Improved Familiar)

Combat

Wingvipers attack by flocking over opponents in a swarm of fluttering wings and poisonous bites.

Poison (Ex): Injury, Fortitude DC 12 (Constitution based), initial and secondary damage 1d8, Strength.

Skills: A wingviper gains a +4 racial bonus on all Listen and Spot checks.