Rune of scavenging (6) does not convert 7% of vitality to condition damage, but, I believe, only about 2%.
I compared taking a rabid amulet in pvp + rune of undead (converts 7% tough to condi) to taking carrion + rune of scavenging (which should convert 7% vital to condi). The overall condi damage of carrion + scavenging was significantly less than rabid + rune of undead.
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