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What's the point of mobility if Holy Call and Plague wipe them out in one or two turns?
It's very useful. Firstly, these spells are terrifying for all creatures of level 1 and higher; Secondly, in the early stages of the game (which is what I'm talking about), you won't encounter heroes very often, but there are tons of monsters guarding this and that, so mobility is definitely an advantage (for example, dodging ranged attacks); Thirdly, energy drain, which has already been noted for both the hero and the creatures.
These are the advantages. Not so bad for level 1!
Of course, you can, but there will be slightly fewer of them than the initial number of Imps.
But there will be more skeletons ;)