Official Move Approval III

[Sarah Kerrigan]

So the axe can...

Be thrown in a straight line
Be thrown and then curved/arced if need be
Be used to intercept projectiles

Can this be used in melee?

It's a throwing axe, so...
Short answer is no, because Raal has no physical proficiency.
The long answer is that Raal lacks the physique to use it in melee, relying on telekinetic force amping the axe in order to throw it hard enough to cause serious damage. he'd have issues cutting grass with it in melee, making it useless for that purpose.