Best build for a single-shot archer

[CountMRVHS]

I'm curious how you might go about building an archer whose goal is one shot, one kill.

Or "one shot, a helluva lotta damage."

I know that single-shot-kills aren't feasible or possible most of the time, and wouldn't be that fun anyway. This is more of an academic exercise. Just trying to load as much damage as possible on one arrow.

The first thing that came to mind for me was getting Sneak Attack somehow. Of course, that's pretty situational.

Paladin has the Smite.

Ranger and Fighter both have ways of adding a lot of damage as well, more consistently.

And then Arcane Archer's Imbue Arrow ability would allow area spell effects to pile on to the damage party.

I know I'm missing something here. Curious to see what folks will come up with.

[Cheapy]

Use this class.

[kinevon]

Go for the vital strike and improved critical chains.

Using a magus, if spell combat can be applied to arrows, can be a lot of damage.

Gravity Bow, of course, can help.
Enlarge Person and a non-enlarged Large bow.

[noretoc]

assasin?

[powell01]

Alchemist grenadier archetype. One shot with explosive missiles.

[StreamOfTheSky]

Myrmidarch Magus using Spellstrike with a crossbow (higher crit range than a bow), applying keen to it w/ his arcana at level 5+.