Well either the 30-50% drop rate is a made up estimate or I have extremely bad luck. I've killed 15 Chillwind Ravengers and still not one drop on the horns... I think quest alone period is shitty drop rate
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It took me seven kills at 100% drop rate on the 56-57 chimeras SW of Everlook. Then on the final drop, it took me thirteen kills. Mobs were easy with interrupts as a 55 rogue.