Alcestus

The natural world faces many dangers, from the axes of humanoids, to rampaging outsiders. Fortunately for all there are just as many defenders who rise to defend the wilds. Alcesti are one example of such.
These defenders are formed from large herbivores with celestial ancestry. They keep their form, but with wings and large antlers.

In combat an Alcestus strikes telling blows with hoofs and antlers. Beams of force strike form their antlers, both defending from arrows and striking unerringly at enemies.

They usually live among herds of their kind, but when their environment is in danger they move to strike against it. Both this and the value of their antlers for the creation of magical items lead them to be hunted by many.
For those living peacefully in or near the roaming grounds of alcesti often see them as messagers of the gods, and on occasion alcesti do indeed serve as such. 

It is said that great champions of nature are at times presented an alcestus as companion and mount.

CR: 5
NG Large Magical Beast
Combat Role: All-rounder, ally

Thunder Rolling Along the Plains is the great horse spirit who guards the vast savannas in the center of Behisris. His hoofsoldiers are celestial horses with wings of grass and antlers of wood.

The Count of South-Belgrad has invited nobles from far and white for a great hunt. The greatest prize is a large hind with golden antlers that has been spotted in the count’s lands. In truth however the count uses the hunt as a way to get rid of the Alcestus that has been blocking his attempts to turn an ancient forest into farmlands.

As the party is traveling through dense woodlands they see a strange animal. It looks a bit like a brown horse or deer, but with striped legs and crystalline antlers. They keep seeing the animal, and it looks like it wants to lead them somewhere.

Monsters of Porphyra 3 p. 18

Agropelter

A first sight a kind of arboreal ape or monkey, a closer look shows the strange, boneless seeming arms and legs of this beast. Agropelters are named for their habit of throwing branches and sharp sticks at anyone or anything they come across.
Their arms and legs look more like flexible tubes than limbs, and are capable of flinging projectiles at significant speed with a snapping motion.

Agropelters are somewhat intelligent and can indeed speak, however they speak only their own language. This combined with their aggressive habits lead most to prefer killing or driving them out over diplomacy.
This is easier said than done, as agropelters life among the leaves of talol trees and are skilled at hiding. When an attacker approaches them agropelters respond with a burst of speed to either run away. The same speed is used to evade ranged attacks.

CR 3
CN Medium Magical Beast
Combat Role: Ranged Damage, Ambush

When a forest fire swept through the outlying area the villagers took comfort in knowing the agropelters would at least be gone. The first to to take a look at the burned forest got an unwelcome surprise, a group of the pests had somehow become infused with the fire. Now the new half-fire elemental [Bloodforge] agropelters are a greater danger than ever.

Trade caravans crossing the Tree-mountains have been harassed by agropelters recently. Capable arboraleers are needed to track the branch flinging menaces down to their nests in the peaks of the trees.

Hairy Jack has won the chicken flinging competition every year since he settled in town four years ago. This, along with his habit of wearing over-sized coats and floppy hat has made him a popular local nutter.

Monsters of Porphyra 3 17

Abaia (CR 13)

The Abaia is a giant freshwater eel, they reside in pristine lakes deep in the wilderness. These good-natured beings seek to defend their homes from being exploited or despoiled. Their great size alone,  large enough to create tidal waves with a slap of their tails, would be threat enough, but they also command powerful water magic to defend their homes.
To those who respect their lakes however, Abaia can give wise council and fair judgment. The long lived eels often guide and protect generations of locals.

The Abaia has also been statted for Bestiary 4, but this version is a Porphyra RPG update of the version that first appeared in 4 Winds's Tome of Monsters.

Marabulo is an ever-boiling crater lake, but is it said that those who can survive a bath in its depth are granted the ability to make boiling water shoot from the ground.

There are two villages on the island, the Locathahs in the bay, and the Strix on the peak. Guided towards peace by their respective deities. Recently the Abaia and Couatl have been at odds, and a neutral party is needed to help resolve the issue.

A friendly benefactor of the PC’s has not heard from a friend for a long time, and he needs the party to check the remote mountain lake for any clues. The benefactor will supply the potions of waterbreathing.

- Monsters of Porphyra 3 10