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Their appearance is to resemble flying whales. Levian wraiths when healthy are a symbol of the feeling of freedom from negative emotion. That being said, they are the only known creatures able to liberate and be immune to the control of shaddow (symbol for negitive emotions/thoughts enduced by nature of the person thinking them). However, levian wraiths are very vulnerable to decay (a symbol for negitive emotions/ thoughts caused by external situations) and so can be taken over and turned into rotting monsters which destroy the fields.
When young, they have six eyes. At adulthood, those eyes group into two. Then at an elder's age, they loose their eyes and grow to be giant serpentine whales. A select few grow tusks when they become elders.