If they just take the gem and nothing else though it might be okay. From the story, it sounded like the gen couldn’t be enchanted with a tracking spell. All they have to worry about is traps and wandering guards. Emerald asks if there is a way to figure out patrol routes or blueprints for the building.
Emerald then remembers that the gem is being transported between safehouses, and that maybe it could be stolen while being transported.
“Hmm… Well that is possible I suppose, but for those kind of secret shuffling of items most guards don’t know where it is going until right before they have to move it. It makes it very hard to plan an intercept route. You’d have to find a good several ideal place for an ambush, and be able to get to them in a timely manner.” Sushi says conversationally.
Emerald asks if she’ll help him figure out a plan.
“Hmm… Okay, I want in. But I want money. Five thousand bits, half now, half later.” Sushi says pointedly.
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Inventory & Spells - http://pastebin.com/D5PzFgGv