Needing advice how to spend my whirlwin battle coin

[Culaio]

During the even I accumulated 138 coins(more actually but I buyed myself "resolution" clothes), now I need advice how should I spend rest, what would be best in the long run, was thinking about buying skin(or two) since its supposedly hard to get  and spending rest on naryuu tablets but dunno if its best choice, I also dont really know how useful is the gem.

 

I am hm 9 kfm, I have true breeze gauntlet and rest of my gear is at awakened oathbreaker level

 

[Shuchin]

Get at least 1 gem, it's pretty good for KFM as we do a lot of CC attacks. 2 gems if you plan on getting a third to fuse it to a heptagonal. Other than that the Skin is a reasonable use of the coins. Tablets are a good investment if you advance quickly in gear as the sealed versions are super expensive, but unnecessary if you progress slowly as there are plenty of slow Naryu tablet sources like Daily Dash and events.