What should I do after level 5 in this build?

[Elosandi]

I'm thinking of making a dexterity based Swashbuckler 1/Investigator 4 for PFS play with as kind of classic roguelike generalist that dabbles in magic without focusing on it, and am not sure what I should be doing after level 5.

I'm currently thinking that Shadowdancer seems like it could be cool to go into as it has a lot of neat looking tricks with the ability to make illusions/conjurations and a shadow companion definitely seems like fun, but unless I go human, the feat tax seems prohibitively steep given that I'll also need to spend a level 1 feat on Fencing Grace. Additionally, after level 4 would it be worth continuing in or should I keep it at level 4 and go do something else, and if so where should I go from there?

Horizon Walker's spell like abilities from Terrain Dominance seem like neat tricks to be able to do like Dimension Door and Ethereal Jaunt, but the rest of it doesn't seem great. Additionally, since it requires level 6 to meet prerequisites, I'd need to figure out something to do for level 6. The full BAB would help with getting an iterative attack sooner though, and I believe would actually get a third at level 12 (provided that the class taken at level 6 was full BAB too) which is within the scope of PFS play.

Assassin doesn't seem all that fun since they lost their spellcasting in the transition to Pathfinder and didn't get much to compensate.

Rose Warden does seem cool to pick up a bit of sneak attack, some rogue talents and even an advanced rogue talent at level 10 like Knockout Blow, Crippling Strike or a Familiar, and Iron Will is definitely a worthwhile feat even outside of being a prerequisite.

Shadow Dancer and Rogue Warden both seem to have pretty cool themes to them as well.

Of course, there might also be some obvious options that I'm missing. It's just that other than Swashbuckler 1 (Early Fencing Grace access, Oportune Parry and Riposte) and Investigator 4 (Int to a bunch of skills, inspiration, mutagen and Alchemical Allocation), I have no idea what to do. What would be a good path to continue on from there?

[ErichAD]

Sleepless Detective might be a good fit, depending on whether or not you took empiricist as an alchemist archetype.

Also, since you're already multiclassing, a level of brawler never hurt anyone, and a urban bloodrager always pairs nicely with swashbuckler.

But, I think just going up as an investigator is probably your best bet. You'll appreciate the spells.

[Chromantic Durgon <3]

I made a similar build.

I went down the route of getting a familiar for scouting and character development reasons.

I also went down the line of Deific obedience to pick up some fun powers and again for character development

[PCScipio]

More Investigator levels.

[Scott Wilhelm]

I don't have a clear sense of what your character does or what you want it to be able to do.

Elosandi wrote:

for PFS play... Assassin

I thought Assassins were Evil, and you can't play Evil characters in PFS.

Elosandi wrote:

pick up a bit of sneak attack

There are lots of ways to accumulate Sneak Attack Damage and lock it in. I can share a whole bunch of those.