Given the way Hollywood produces its makeup, masks, and costumes, Creature is really expensive to execute. We're talking Demagorgons from Stranger Things-level intensity in terms of costuming hardware. (Now, you could argue there are more inexpensive solutions available, but...)
I had heard the original plan was "Dracula's Revenge," which seemed to tie in Hollywood's Dracula versus The Mummy idea. (Dracula, mourning the loss of his brides, seeks the amulet to gain new power, seek vengeance, etc.) The waters got muddied when Orlando wanted to use the Wolfman, which Hollywood had already utilized in 2019, leading to the current setup (which sounds like will mostly just throw Wolfman into planned Dracula/Mummy scenes).