

Now that you mention it, just creating an “item” that is effectively just an armor flavored as tattoos has its own advantages.
For example, at higher levels the character could apply armor runes directly to their body. Thats pretty cool in and of itself and also in tune with the idea of expanding the tattoo with different effects. All with minimal effort and without having to worry about balancing issues because the rules are already there.

Also not who you replied to, but I had a quick look at what I could find online.
It is a pretty deep system, where factions take their actions in the background in turns every ingame month or adventure. They all have their own stats, bases of operation, assets, goals, etc. and can attack each other, expand, gain influence or wealth and a whole lot of other things.
Basically its a “the GM plays a strategy game by themselves behind the scenes” approach. Personally, I think its a bit too involved for its purpose unless you really enjoy playing that solo game in addition to all the other game prep.