Hey there. I've been looking through the Bestiaries and have came up with a couple new ideas for some monsters:
1st: a revamped version of the Hadhayosh. honestly looking at its statistics, and some of them don't make a lot of sense; like, I know it's supposed to be super powerful, but why does it have stench?
Also, I wanted to play around the concept that these used to be war beasts made by some deities, and are usually gifted to the most loyal and most powerful of these deities followers (in terms of the core deities, I've found the best neutral deities that would be associated with it-Sarenrae [NG], Abadar/Irori [LN], Gozreh/Nethys [N], Gorum [CN], and Uragathoa [NE]). The new concept would be that the revamped Hadayosh would have different alignments, types of damage resistances, damage types (holy, unholy, anarchic and axiomatic), and even a few spell-like abilities depending on their alignment. I felt like this revamped version could be utilized to make the Hadhayosh much more interesting as a monster than just a giant fire elemental bull. As for what it keeps, I can still see it having the frightful presence and the frightful charge abilities (though if that seems too OP, then we could balance that out for just letting it have frightful charge-which would work like frightful presence, but only if it makes a charge attack), it can still have immunities to acid, electricity, fire, and sonic, while still being vulnerable to cold, and can still have godforged horns (which have it's gore attack count as silver and cold iron for the purpose of overcoming damage resistances).
2nd: okay, this is an original monster that I call the "fey mannequin"-what this is, is a floating puppet-like creature (think like Puppetmon, but without the legs or the X on the back, having some thin, string-like tentacle on each finger, and looking more life-like and not made of wood). how these creatures would fight is that they would use a "puppet possession" ability-which allows them to control a humanoid or monstrous humanoid (if it fails the save), and use their attack rolls, AC, etc; killing the controlled monsters won't work, for I can see that actually giving the fey mannequin either a boost in attack, AC, hp, or a combination of the three. The only way to get a victim out of it's control is to either attack the "strings"-which would have similar AC to the fey mannequin, but much less hit points, and count as a separate monster. This would also deal damage to the fey mannequin, and successfully destroying a controlling string has the chance of stunning the fey; however it's risky, as it can cause an attack of opportunity from the monster being controlled.
The whole point of the fey mannequin in battle is to have a puppeteer monster (I think that there's already a monster like that, but I want to make something that's at less strength and meant for early encounters) that tries to use other creatures to fight for them; I can see the lore involving them loving to use victims to unwillingly murder others on its behalf (and yes, these fey would be Chaotic Evil).
So, what do you guys think?