I've seen this exact concept used quite often over the few years of ARR. Hell, one of my characters has a very primitive version of it that uses a stored pool of aether to fire off a single aetherical blast as a last resort. Its a once a week deal and leaves them pretty much out of commission afterwards.
Its possible in theory and as there isn't really any lore to support the effects of doing so... just balance it however you see fit.
[Edit] - I also see no reason why the tattoo's couldn't be non-visible until they're actually used to channel aether along them (Which is how my chars tattoo's work).
Its possible in theory and as there isn't really any lore to support the effects of doing so... just balance it however you see fit.
[Edit] - I also see no reason why the tattoo's couldn't be non-visible until they're actually used to channel aether along them (Which is how my chars tattoo's work).
