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So, some of the Sage-level weapons have effects like "Palm can be seen as Weapon" or "Fist can be seen as Concealed Weapon"... For anyone who's curious as to what that actually means, I just tested out a couple of them and can report.
Unlike what one might presume (and what I'd hoped for/originally made the weapons to do), this does not allow those move types to gain beneficial counter relationships (as in, a "Palm seen as Weapon" move would not be able to counter other palms and fists, nor would it be neutral against weapon). At first I was a bit disappointed, but then I discovered that...
They do count towards activating skills using the given move type, and they can combo into each other as though they were the same type. What this means is that if you have a skill that requires 5 concealed weapon (CW) moves to activate, and you have 3 palm and 2 CW moves on the board, you can string all of those moves together in any combination without using omni or shift moves and it will count as being "5 CW" for the purposes of activating that skill.
Mind, this doesn't entirely go both ways... While palm skills will count as CW for activating CW skills, the reverse is not true. CW moves will not count towards activating palm skills.
However, if you have a skill that requires 2 palm, 2 CW to activate, queueing up only 2 palm moves will be sufficient to activate the skill since palm now counts as both.
If you dedicate both your weapon and concealed weapon slots to the purpose, it's possible to make palms or fists count as three different move types simultaneously, which is pretty funny. ...however, this would mean picking something other than Snow Slayer as your weapon, which is unfortunately a bit unattractive given how hilariously busted that thing is.
And further in the realm of misleading/incomplete descriptions... There's an inner kung-fu that says it "when battle starts, grants one stack of Star Shifting or Flower Transposition", which is kinda lame, honestly... Thankfully, that's not what it does at all! It doesn't actually provide a stack of the buff itself, it grants an activation of the skill if you have it equipped. This is actually better in a lot of ways, since it lets you use the skill when it's most needed to neutralize an enemy's skill or move lineup.
...and it'll let you do it a lot, because it actually activates once every turn, not just at the start of a battle. And it will only give you an activation of a skill you have equipped, so if you've only got Star Shifter, you'll be building up a free charge of "remove the enemy's readied skill, please" every turn. If you also happen to play the moves required to activate it normally, you get another activation as per usual. And it'll just keep stacking every turn.