Ninja Ninjutsu lore questions.. help

[Zojha]

If I was going to fudge the system for the sake of roleplay, I'd probably stick with "unknown combinations" rather than "unknown mudra". Seems a rather large liberty to take without precedent.

In fairness, there are two occasions where our ninja NPCs refer to "mudras" that seem to be unavailable to the player:
1.) In the 45 quest where Oboro mentions a mudra of summoning (Used by Karasu).
2.) In the 50s quest where Oboro mentions a 4th mudra he thought to be a myth (Used by Gekkai).
At least, in the english version. Note: Both are combat text during the respective duties. The first one manifests as a ritual circle witch, according to an NPC in the (54? 56?) quest carries a "disagreeable cost" and has no hand gesture associated, the second one causes 3 clones of the user named "Chi, Ten and Jin" to appear, all capable of using ninjutsu themselves. The animation for that is a "Ten" with a more flashy effect. A summoning technique is further casually employed by Oboro in the 30 quest to summon wisps and a toad.
3.) As a third point, the lore book calls "Chimatsuri" a complex mudra (Even though it looks like a combination of dozens of mudras - Unclear terminology!)

That said, the whole ninjutsu lore is pretty wonky and a grey area. Kassatsu and Shadewalker for example have very distinct finger and hand movements associated with them, just like mudras and they, too, evoke magic effects - Mudras or not? Then there are things like shukuchi which from the animation seem to require no mudras at all, yet seem to be magical. In the cutscene with the Sahagin priest, Yugiri uses a mudra-less ninjutsu that shocks enemies in the vicinity just by planting her dagger in the earth.

Trying to make heads or tails of that is, uh...yeah. Difficult. I personally was kind of hoping the lore book would be more helpful in that regard, but...not really. That said, Ninja roleplay is pretty iffy, because ninjutsu is not a very well documented art.