The first few Thanatos generations are incredibly huge, able to contain 1000s of smaller ships within them. These Thanatos units were segmented so that their bodies could be easily transported along with any cargo they held within their bodies. These Thanatos units have many small legs which they use to drag themselves across land when they do not have enough fuel to fly.
After these first few Thanatos generations, they were greatly changed due to how costly they were to build. The common Thanatos is 6 to 7 feet tall and looks like the skeleton of a lizard-like species. The head and body of them is box-like to allow easy storage.
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Both types of Thanatos units have multiple spikes on top of their heads.