Both yes and no. You can make your monsters, magic laws, and so on, but you must stick to what you've made, or your readers will be disappointed.
The biggest issue is with well-known monsters such as vampires and werewolves. Do you stick to the conventional vampire norms of no sunlight, animal transformations, and so on, or do you branch out and risk irritating readers who want their vampires to hide from the light? The majority of your readers will agree to let you make modifications, but they must fit into your reality. cheap reliable essay writing service.