About stats... We have items that give +1 to stats (rings, terra items), we have items giving +3 to stats (wizard hat, cat ears...). I was hoping we'll have some sort of necklaces to give +3 or +5 to stats, but those next-level items could also be the assassin outfit. Of course each piece of cloth should raise different stat. So what should an assassin be? Stealthy, agile, kill with 1 hit, lucky lockpicker, cast some magic (I'm influenced by TES series

There should be some penalties and limitations. Items wearable for lvl80+ (so not only illia heroes enjoy the increased powers). But let's not mess with the stats, or defense (like illia items, that lower defense). Maybe lowering attack speed? (not drastically). Or being overweight all time? (the memory of your victims burdens you, assassin!).
Right now I can't talk about defense and magic attack reduction of the items, it must be thought through. Maybe something between terra items and forest armor.