Mangonnel
This reptilian creature with a slim, dragonlike body, head, and wings. Its body cascades easily through the waves before soaring into the air.

Mangonnel (CR 3; XP 800)
NE Small dragon (aquatic)
Init +4; Senses blindsense 60 ft., darkvision 60 ft., low-light vision; Perception +1
Defense
AC 18, touch 15, flat-footed 13
(+4 Dex, +3 natural, +1 size)
hp 25 (3d12+6)
Fort +5, Ref +7, Will +4
Immune acid, sleep, paralysis
Offense
Speed 10 ft., fly 50 ft. (average), swim 60 ft.
Melee bite +5 (1d6+1 plus saliva), tail slap +0 (1d4)
Special Attacks saliva
Statistics
Str 13, Dex 19, Con 14, Int 4, Wis 12, Cha 8
Base Atk +3; CMB +3; CMD 17 (can’t be tripped)
Feats Flyby Attack, Skill Focus (Perception)
Skills Fly +12, Perception +10, Stealth +14, Swim +9, Survival +7
SQ amphibious
Ecology
Environment aquatic
Organization solitary or pod (3-12)
Treasure standard
Special Attacks
Saliva (Ex) Mangonnel saliva contains toxic enzymes that rapidly break down and soften bone. Anyone bitten by a mangonnel must succeed on a DC 13 Fortitude save or suffer 1d4 points of Constitution damage. If the initial saving throw is failed, the victim must make a second save 1 round later or suffer temporary damaging effects to a body part. The save DC is Constitution based. This is considered a poison-based attack.

d% Body Part Additional Effect (1d6 rounds)
1-40 arm -4 penalty to attack rolls
41-80 leg half base speed
81-100 torso or head fatigued

The mangonnel is a small and distant relative of true dragons that is surmised to have evolved from small dragons that adapted to an aquatic environment. It is amphibious, and can fly through the air as easily as it can swim through water. The mangonnel has no legs, and must slither along like a snake when on land. The mangonnel is famous for the enzymes it produces in its saliva. These enzymes seep into flesh, and can turn the bones of a man to goo in a matter of seconds. A mangonnel does not like to let prey escape, so if it has wounded a creature with its bite it will continue to track its prey for hours or days.

The saliva of the mangonnel is its real treasure, and anyone slaying one can extract 1d2 doses of the saliva with a DC 15 Survival or Heal check. This saliva can be used to coat any weapon like a poison, and if kept fresh, delivers the same effects as the bite of the mangonnel.

An arcane spellcaster who is 7th level and selects the Improved Familiar feat may gain a mangonnel as a familiar if they are of neutral evil alignment.

On Porphyra
Mangonnel are known to inhabit the Bay of Jade to the north-east of the Last Kingdom. It is thought that mangonnel were bred by the erkunae of G’sho’laa’n’rr to help control their slaves but the mangonnel escaped captivity and migrated north to cooler waters.