What's the '??? Wood' needed in the Hikauri?

[Kanore]

http://www.pso-world.com/items/psu/15/941/board_hikauri/

I've been looking for it for awhile now >_>

[Lovejuice]

You can use either Neu Wood or Kubara Wood in synthesis.

Using Kubara Wood yields the Alteric (http://www.pso-world.com/items/psu/1/953/alteric/) bow rather than the Hikauri. The synthesis success chance is also lowered.

But yeah, otherwise, Neu wood gets the job done.

[Choja]

??? Wood means you either place Neu Wood (resulting in the six star Yohmei Bow Hikauri) or Kubara Wood (resulting in the six star Kubara-modded Alteric) in the slot.