akantor bow, adrenaline+2 and earplug for armour skills with 50 power coatings, 20 empty bottle, 20 nitroshroom, 5 flash bombs, 2 tranq bombs, 1 shock trap.
The reason i flash bomb it is because rubys are so rare and i havnt the time to run around constantly to aim at it then finding out i die later on wasting 30mins of my time.
So i just flash him then shoot the hell out of him. 5 flash bombs and the 2 supply ones are enough that by the time im finished bowing him he starts to limp.
Also, bomb materials and flashbugs and nitroshrooms can be bought easily at that lady, so i stock up on loads of them then start speed killing. Since i got 3 rubys in 1 kill... i think it works