Weapon Advice Pathfinder

[Nosta]

First off I'm looking for the most visually intimidating Single edge Axe a Human can swing around in one hand. Feats and features ncluded.

Secondly I'd like the axe head to be made of stone very strong magically enhance stone

I know I can grab improve crit but any way to increase the crit rate even if by one by level 7 or increase the crit multiplier?

For flavor and to get a visual it dose not so much as cut the goblin in half as it cuts cause its some what sharp but the weight and power of swing bashes the goblis head in two and strait down the middle

[Kurald Galain]

I know I can grab improve crit but any way to increase the crit rate even if by one by level 7 or increase the crit multiplier?

Sure. Buy a keen weapon, or play one of several classes (like Magus) that can temporariliy make their weapon keen.