World Bosses are a big challenge in Crystal Saga. We all know that they are very strong and difficult to defeat without a team with a healer, a tank, and a damage dealer. Here are some screenshots of all the World Bosses and their locations. If you are trying to defeat them, just check below first. Thank Akirye who posted them on blogspot.com.

Dream Princess:

Dream Princess is level 20 and can be found in Himeng Valley.

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Torvo:

I forgot to show it in the screenshot, but Torvo is level 29. He can be found in Kaymo Mountain.

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Auron:

Auron is level 36, he can be found in the Lycanmarsh.

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Ice Queen:

The Ice Queen is level 45, You get to the Ice Queen by going to Celestial Palace. Keep going deeper in till you come to the "Celestial Palace Courtyard" and she will be in the bottom left room.

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Nepenthor:

This is the last one i could find. Nepenthor is level 60. Starting from Bloodfang Village, open the world map and click on "Altar of Sacrifice". Once you've made it in it'll be like it was with Celestial Palace(see above). Continue working your way down until you come to the "Altar of Sacrifice", Nepenthor will be in the top right corner.

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Source: Crystal Saga World Boss List from blogspot.com