Zurvan Extreme, 99 times for the mount. More than half of those clears being painful, and those 99 clears making up a little more than half of the clear attempts because... ugh people....

99 totems is too damn many, especially when getting a "farm" group (that lasts more than one or two runs) is more challenging than the instance even when it was brand spanking new. Once I had that bird, and the Firebird by extension, I felt so mentally exhausted for a couple days.