At the top of the tree you will find the NPC Teza who will teach you the Skypiean Glide ability for 10,000 Peli. Without having the Skypiean race, you will not be able to obtain the Glide technique. This move scales with hp, the higher your health the faster you will be, and vice versa.
Quests[]
Sky Guardians Quest
Quest Giver: Raze
XP: 600
Money: 400
Each Sky Guardian gives 90 XP and 100 Peli.
That means you get a total of 1500 XP and 1400 Peli when completing the quest.
(although the Sky Guardian quest gives more exp, it does take quite a bit longer to complete than the Castle Guard quest.)
Bruno Quest
Quest Giver: Rae
XP: 1000
Money: 600
Bruno grants 700 XP and 300 Peli.
That means you get a total of 1700 XP and 900 Peli when completing the quest.