The pet was offered along with the Greenman Pet in Korea as the prize for an Arbor Day-related event (April). The quest is under the same category as the Submarine Mirage Isle Event, so it'll be a potential temporary event that we might get later on.As for event quest details, it looks like you first needed to complete this quest - http://archeagedatabase.net/us/quest/5196/ where you're given a "Wisdom Tree" to plant on holy grounds either in Western Ezna or Eastern Austera. Somehow, you get a Wisdom Tree Branch from that quest (Might be quest award, from the tree directly after planting the tree, maybe have to wait for tree to grow, not sure. Just know that you get one.). You can only plant one tree per day, meaning you only obtain one tree branch per day.During the event, there are also two other temporary NPCs, a Greenman NPC with a quest - http://archeagedatabase.net/us/quest/5200/ and a Treant NPC with another quest - http://archeagedatabase.net/us/quest/5199/ . Both of them ask you to bring them 7 Wisdom Tree Branches, and once you get those 7 Tree Branches, turn it in to the NPC and you'll be rewarded the Pet as the event reward.Basically, when the event comes around, collect 14 Tree Branches, turn in 7 to Greenman NPC for Greenman Pet and turn in 7 to Treant NPC for Treant Pet. Additionally, the NPCs state in the quest info that they only stick around for 15 days, so to get both pets in this event, you'll need to plant trees 14 out of 15 event days.Of course, the event might be subject to change when Trion releases it to us, but if they decide to keep it the same format, that would be how the event goes.Also, here is the information on the pets themselves (Skills and whatnot):* Wisdom Tree Pet - http://archeagedatabase.net/us/npc/12858/ * Greenman Pet - http://archeagedatabase.net/us/npc/12857/