Upon reaching rank4 with Soridormi and doing the Time rifts you will receive a Greater Encapsulated Destiny. When you use the item it will tell you to choose between a mount and a pet. Although the pictures explicitly show items available doing these time rifts, the description says, “The next Time Rift you complete is guarranteed to reward you with a Mount!” or combat pet if you choose…
DON’T be like me and assume that these time rifts are talking about the era they represent, the items available are the same one’s you can buy. And since I already owned all 6 mounts by the time I reached R4, there were no mounts available. I have had this buff all day, and like Sisyphos I may be doomed to have it forever. lol