Hunt Prey action from ranger - https://2e.aonprd.com/Actions.aspx?ID=10
Plus feats building off of that
https://2e.aonprd.com/Feats.aspx?ID=493
https://2e.aonprd.com/Feats.aspx?ID=867 - relentless stalker is especially interesting to me
https://2e.aonprd.com/Feats.aspx?ID=501 disrupt Prey
https://2e.aonprd.com/Feats.aspx?ID=1774 - This one is also super interesting to me, grants Hunters Vision focus spell
Maybe a Hunter's Edge too? https://2e.aonprd.com/HuntersEdge.aspx
random monster abilities that I think are interesting
Blizzard Evasion [reaction] Trigger Ainamuuren takes at least 40 points of physical damage from a single attack, and he isn't currently discorporated; Effect Ainamuuren discorporates into a whirling blizzard for 3 rounds. During this time, he gains resistance 10 to physical damage and weakness 10 to force damage. He gains a fly speed of 40 feet, but the only action he can take is to Fly. While discorporated, the first time each round that Ainamuuren enters another creature's space or a creature enters Ainamuuren's space, that creature takes 4d8 cold damage and must succeed at a DC 34 Fortitude save or be stunned 1. At the start of his turn, Ainamuuren can end this effect as a free action.
Numbing Ice (cold) A creature who takes damage from the benthic reaver's eye beam Strike must succeed at a DC 41 Fortitude save or become slowed 2 as cold stiffens its limbs. A flying creature who fails its save also descends safely to the ground below. This is forced movement.
https://2e.aonprd.com/Curses.aspx?ID=51 Blackfrost curse? I think im pretty into something like this. Maybe modify it to something like those effects as well as those who have been marked by it can always be sensed by the Hunts riders. Take out the stuff about turning into a zombie, thats not the vibe.
Raise Blackfrost [two-actions] (cold, conjuration, occult) The blackfrost prophet selects a point within 60 feet, then calls upon shards of blackfrost to stab up through the crust in a 30-foot burst. Creatures in the area take 2d8 piercing damage plus 2d8 cold damage (DC 28 basic Reflex save). A creature that takes cold damage from this ability is exposed to blackfrost. Until the next time the blackfrost prophet uses Raise Blackfrost, the affected area is difficult terrain.
Icy Deflection [reaction] Trigger The ice yai is targeted by a ranged Strike or spell attack roll that doesn't have the fire trait; Effect The ice yai creates a reflective blockade of ice, gaining a +4 circumstance bonus to AC against the triggering attack roll. If the attack misses, the ice yai redirects the attack to another creature within 20 feet of the yai. The attacker rerolls the attack roll against the new target.
Obviously all of this would by adjusted to scale with current power levels and dcs and such, but this is where I'm looking atm.