And I have acces to the light world now.
My questions are;
Are there multiple versions of the light world? I've been there only once, and it was the Albatross area with heaps of metal king slimes.
Eugeen Poole, where can I first find this man? I dont know where to look.
The incarnus (i believe, i dont remember exactly what the monster was called), I fought the monster once, killed it and it told me i was ready soon or something along the lines of that, do i go back to treepidation at a certain time?
What do I have left to do now? Just fill out my monster library and fight eugene some times?
Thanks 
1. The Light World is always the same, the only difference is that there are different paths to get there. These are the directions from the room with the obelisk in it. Slime - left, down, down. Demon - right , down, down. Dragon - Up right right right. Undead - up , left, left, down, left. Nature - up, up, left, left, left. Material - up, up, left, up, up, up. Beast - right, right, right, right, up, right
2. Eugene Pool - travel to each area (excluding dark world I think) and Zip to the Zip Portal. You will notice there are no monsters around, and you will be able to see him from where you are standing most times. He is only near zip portals.
3. The incarnus spawns between 6 locations. Treepedation near the zip portal, take the vine ladder up. Doubtback - take the zip portal, head to the area near the missing lynx cave, it will be to the right of the cave entrance, in the corner. Cragravation - take the zip porta, climb all the way to the top area, exit down the ladder on the right side of the screen back to the previous area, you should be able to see the glyph from there. Iceolation - take the zip portal, take the south exit, hug the wall on the right side. It will lead you to the northern most part of that map. If the glyph isnt there you should see a blue chest. Unshore - go into the second area (cave), go down the vine ladder and across to the next ladder. Climb up and head into the cavern straight in front of you, the glyph should be within 40feet of the ladder. Bemosoleum - This glyph is inside the blue doors in the first area. If the doors aren't open just portal back and forth until they are.
In my experience, the glyphs pick a spawn location and stay there until you find it. So I wouldn't zoom out and try to go back to the same glyph location multiple times.