Gabal Feteh tells you, "Hello. Myself and my brothers-in-arms have been assigned to exchange gifts with those that donate undead trophies to the Shagar Zharalim. We were not expecting the plethora of trophies we have received, so we have adjusted our prizes accordingly."
You give Gabal Feteh A Large Mnemosyne. Gabal Feteh tells you, "Thank you. Here is your reward." Gabal Feteh gives you 100 Soulrender Arrowheads.