Located at -280, 365 (due east of the small bank).
You can turn in the Bloodmetal Inlaid Gnollish Totem (anniversary item) to this NPC to unlock five gnoll shrouds. Leveling up these shrouds increases the AC bonus granted by this item (up to 173).
In the War Games Anniversary Mission you will find a Bloodmetal Inlaid Gnollish Totem in the chest, upon looting this you will then turn it in to Yaldu Bwor (the Gnoll shroud NPC), this will unlock 5 Gnoll Shrouds to use, as you level these shrouds the AC buff on the Totem Clicky will gain in power, at max rank it is 173 ac at level 100. This AC buff stacks with all other AC buffs.