What are the cost and restrictions or benefits of a creature being able to slowly morph from an animal to another while retaining memories?
The creature morphs to giant eagle then morphs into fish and then back to its original shape. While transformed, the creature retains all its mental abilities and memories.
Changing from one species to another is more like learning how to use a bike, can be difficult at first but then it gets easier.
Such creatures can also selectively morph only specific parts of their body,for example growing tails and wings or changing limb shape.
Question inspired by the Heteromorphic characters of Overlord
In YGGDRASIL, there existed a multitude of different races. They were generally categorized into three main races; namely the "Human" race, "Demi-Human" race, and "Heteromorphic" race. The following context below is a list of current races that were introduced so far in the Overlord series.
The shapeshift won't be instantaneous like in Overlord but might take a few days for things like changing the shape of ears and eyes or months for turning into a different animal.