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it does not drop in arenas, and probably never will.

but the funny thing is that 2 chars got 2 scrolls already, and 1 char even 3, while most of them still sit @ zero xD i guess some chars are just lucky af :o

i did arround 17-20bgs with my chars, wich means arround 400-500bgs. i got 11 scrolls so far.

So by my statistic roughly 2-3% chance

You have to farm it anyway thats why.
Its like going icc with guild or with pugs. Guild run eats icc boses like premade groups eats lowbies in rbg.