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this vardorvis kill took me 4:06 minutes
it cost me
>16 doses of saradomin brew (16 x 2400 = 38.4k)
>3 doses of super range (3 x 780 = 2.3k)
>1 dose of super combat (1 x 4500 = 4.5k)
>6 anglers (6 x 1800 = 10.8k)
>9 doses of super restore (9 x 3300 = 29.7k)
>1 dose of surge potion (1 x 1250 = 1.3k)
>13 dragon ruby bolts (13 x 3500 = 45.5k)
>5 thrall casts (5 x 1260 = 6.3k)
>86 suffering charges (2 x 750 = 1.5k)
>1 ring of shadow charge (1 x 900 = 0.9k)
>1 divine ranged prepot dose (1 x 2000 = 2k)
>2 angler prepot eats (2 x 1800 = 3.6k)
this comes out to uhhhhh 146.8k

the kill gave me
>120 pure essence (120 x 2 = 0.240k)

unless my maths is bad I have made a nice -146.6k profit
not counting the 4 minute kill + 1 minute travel opportunity cost I could have spent at whisperer for (5/60)*70m = 5.83m profit