Vampire hunter gestalt advice

As the title, I’m trying to come up with a vampire hunter build, my first thought was vampire hunter/herbalist alchemist, issue is I have no experience with either class any pointers would be appreciated.

I'd say maybe go with vivisectionist alchemist, get sneak attack damage

I’ll take a look at vivisectionist, only reason I went herbalist was so it wasn’t so MAD

What are you looking for the character to do? Other than both using WIS as a casting stat I am not seeing any synergy between these classes. The most important thing in a gestalt game is to choose two classes with good synergy. The gold standard is to get full BAB, all good save, 6 skill points per level, 9th level casting and class abilities that work well together, and can be used together.

If the class abilities have really good synergy than missing the gold standard is often ok. Unchained Monk has really good synergy with the inquisitor so dropping down to 6th level casting does not cause a problem.

If you want both classes to have magic you might want to consider Hunter instead of alchemist. Both classes are WIS based spontaneous casters. You would be sacrificing full BAB to gain 2 6th level spell lists. Unchained Monk would get you flurry of bane which is insanely good. It also gets you both stalwart and evasion.

I’m looking for a more martial focused character with something to support the party on the side, don’t really want a full caster.

Instead of Herbalist Alchemist I recommend Herbalism bond Nature Fang Druid. That seems to have much better synergy. It is a full caster, but Nature Fang is very martially focused (there are a lot of slayer talents that will get you bonus feats and other perks, like trapfinding) and you still get herbalism with which to mimic alchemists rather effectively.

Yeah, I tend to think about gestalt very differently than others seem to… for me, gestalt is just getting to mix 2 things you’d like to play, as long as they aren’t mirroring each other. My favorite gestalt is a Kineticist and vanilla Summoner. All sorts of spells that complement my Air Elemental theme, and an Air Elemental partner for those times I need a linebacker to tackle a threat so I can do what I need doing.

If you have your martial set, and support is your gestalt, you need a class that can do their support without taking up your combat rounds. Paladin Warrior of the Holy Light is an idea… being able to give up spells because you already have spells is easier than playing that archetype without gestalt…

Btw, just wanted to add… my summoner gestalt has not a single summoning spell, not a single offense spell, not a single defense spell… if you have a solid primary, you can have a lot more leeway on what you do with your gestalt…

A Vampire hunter inquisitor / Corpse hunter ranger both have WIS as casting stat, have lots of bonuses against undead, eventually give you both evasion and stalwart, you'll have full BAB and all good saves.

If alchemy style extracts/infusions feel a better fit, consider the Energist archetype which gives the alchemist positive energy bombs or the investigator which adds studied strike. Archetypes for investigators that fit a vampire/undead hunter theme: dread investigator, gravedigger, or lamplighter.

I know it’s not pathfinder but would a factotum/inquisitor or the like work?

I would go with paladin/ranger. Maybe with an oath against undead for the paladin. Favored enemy (undead) and smite will make short work of vampires and their spawn.

Paladin/Ranger is going to be incredibly MAD. They will be limited to medium armor so will probably be forced into a DEX build. They will need both WIS and CHA for spells and only get 4th level casting.

There are lots of powerful gestalt combinations. Just so many. And people commenting here will have their personal preferences. But what do you like to do? Do you prefer half-casters? Are you wanting to be in melee more or less? How much do you want to sacrifice to specifically focus on killing vampires?

So far you've expressed interest in 4 classes, but I'm not familiar with the factotum nor sure which version you are using. I would suggest that you prioritize getting as many good saves as you can, and if you have any plans of attacking then you need to have full BAB in one of your picks. And it's a good idea to not mix requirements on mental stats. For example, you don't want to have abilities based on intelligence competing against your abilities based on wisdom. That said, some classes have no real mental requirements, so don't ignore those. Therefore, a vampire hunter/barbarian wouldn't be much of a caster, but otherwise would still be a good combo.

Vampire Hunter
* Pairs well enough with inquisitor.
* The herbalist alchemist is wisdom based, so should be a decent pairing.

Do you mean Vampire hunter the inquisitor archetype or vampire hunter the base class?

The Vampire hunter base class is a d8 hit dice class with 2 good saves, 6 skill points and full bab.
Which means we ideally want to pair it with a wisdom based class that has good fort saves.

Natures fang druid is a good shout, as is frankly any cleric, and f.e. Pharasma is pretty neat for such things.

Psychopomp usher could combine reasonably with it.

If you are looking at at the inquisitor archetype, either slayer or ranger would come to mind, as they would grant 3 good saves, full bab, more hp and in the case of the ranger an extra animal companion.

You could also gestalt with barbarian, pick one of the barbarians with animal companions, and go to town this way.