To find this mob in-game, use BACKSPACE to open the World Search window, then enter Grand Spirit in the Search field and click "Search". Remember, the field is case-sensitive and must be entered exactly as shown.
Warning! All Elite mobs in Jungle of Hortek are MUCH harder than they are anywhere else. As a Good-equipped 93 Warrior/Mage with 25k HP, the Grand Spirit (86 Elite) one-shotted me. We strongly advise you get several quest chains up to the point where an Elite mob is required to advance, then ask a high-level guildmate to come kill them all for you. With a little effort, you should be able to clear at least 3 or 4 Elites quickly.