Fan-Ball Wiki talk:Pet Practice Arena/@comment-1917722-20150322162055/@comment-16075172-20150325195203

Leviathan's description says "This pet [...] will proceed to eat all the continents" which is saying that Lev is bigger than a continent, clearly by a lot. And Cassiopeia, as you just said, is smaller than (or equal to in size) a continent-sized island, meaning that Leviathan is of greater size than her.