The sage land: It is the world/ other dimension where the birds like hawks, harpy eagles, ravens and so on and so forth, basically where all the bird summon types live, and the three other sage lands which are Mount Myobok, ryuūchi cave, and Shikkotsu forest are connected to it, but they are not in the same dimension they are different regions and the sage land/bird land/eagle land is it's own region like the other three (Btw can someone give me a name for the bird/eagle land?)
Abilities: they don't have their own sage mode... but...(Chill...jeez) they have sage moves like what borudoman displayed (Chapter 22) but they differ as the inhabitants of sage land which are mostly eagles can only have one element in which they have full mastery over probably even more than madara had with his fire element.
Sage eagle: The sage eagle is a roc eagle (Am sure everybody knows what roc eagles are) A golden one at that, it was once a normal roc eagle nothing special about it... but when the ten tails was defeated some of its chakra was somehow able to enter the roc eagle but because it couldn't endure the overbearing chakra of the ten tails... it eventually died... well seemingly... seeing a supposedly dead giant eagle... the snakes of Ryūchi cave carried it body with a little difficulty and took it to their cave... but when they got back to their cave they fought over who was going to take the first bite and probably eat it alone... not noticing the eagle's body turning to stone... after a bit of fighting a red scaled snake won and when it tried to take a bite out of the corpse, it couldn't bite through, not understanding what was wrong it bit deeper with its fangs (ik snakes just swallow their food but the eagle was too big for them too even fit into their mouth so they have to bite) hearing a crack before another one sounded the other snakes looked around and the red one did also but after a couple more cracks a golden glow brightened up the area in which a golden roc eagle broke out of the stone in which after a loud squeak and a strong force breaking through the ceiling of the cave, the golden roc eagle flew off. (And stuff happened in which we now have the sage land/bird land, please give me a name).
Borudoman: A inhabitant of sage land and once strongest eagle (not stronger than the sage eagle tho) that mastered its fire sage arts and even improved it with nature chakra making lava hotter than normal lava and could be further enhanced with nature chakra, but, one day and a hundred years before the warring era it had a confrontation with a snake of Ryūchi cave and won but after the fight it's his behavior started to change from the once short tempered and intelligent eagle to the cruel and reckless eagle, it seems like something happened with his fight with the snake to have change his behavior... fast forward to the warring states era, his cruelty didnt go unnoticed by the sage eagle, but the golden eagle didnt say anything but just watched, after getting bored of always beating his peers it began leaving the sage land illegally and fought with humans, but after a year of killing and Masssacering whole clans and such it came across madara and after a long battle with him they came to a standstill, and this went on for a couple of years untill madara awakened his mangenkeyo sharigan making their battle have a compete flip with madara completely destroying him and taking control of him and using him in his final battle with Hashirama even with borudoman on his side Hashirama beat him with a lucky shot... but after getting his senses back and recalling everything that happened, his hatred for humanity peaked especially when he see's the magenkyo, not taking the defeat borudoman was ready to eradicate all of humanity but was confronted by the safe eagle, and after a quick fight, he lost and and used a sage relic in which he stole from the sages quarter, later escaping.
Sage relic : A relic made by the sages eagle, once directed towards a certain area or person it rewinds their time to when they were not touched, secondary use is to teleport to any where in the world by just imagining said place or just saying the name outloud. only thee were made and one remaining.
Purple ball also called the Power storing ball : is a purple ball in which half or more of someone's full power is kept when leaving the sages realm via using sage eagle made relics or just leaving the sages realm illegally (Borudoman had a special way so he could leave illegally while attaining his full power) and borudomans full power was halved when he used the sages relic to escape the sage realm.