Yeah… I didn’t want this 10 minutes ago but I now really badly want this. The Throwing Axes, that is.
However, more to the point: @Revy really nails it for Sienna’s weapon combos. Her kit has never been entirely reliant on her melee weapons as her staff is so outrageously effective. This being said, it means her melee weapons tend to be catch-alls that aren’t super effective in any one field (unless the crowbill is applied righteously to some Storm-Vermin’s forehead).
This being said, she does have a 2-handed mace, but it might not be your favorite weapon by the sounds of it. However, thematically, it would be hard to justify a Bright-Wizard (other than Unchained, maybe) hauling around an enormous greatsword. Maybe that’s personal opinion, but it seems a little off.