Inferno is a castle of evil, inhabited by demons, devils, and imps...
The Castle is a castle of good, inhabited by angels and humans.
If you want to create a castle of angels (and you need to come up with units, because a castle shouldn't consist of different types of angels), you'll have to modify the human castle (remove the angels, archangels, and maybe even the griffins). So, you'll have to continue working on the human castle as well.
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