A website or software (for writing novels) that searches for information about cultivating immortals?

I think the Yao Ji application is very good. I used to write novels with this APP. There are many monsters, ghosts and gods in it. Their legends, habits and characteristics are introduced, and there are classifications in it, which are convenient for finding and searching. I think with this APP, there should be no shortage of materials.

Yao Ji, cbaigui.com, an open online "monster" database. Committed to collecting, sorting out, introducing and sharing the "monsters" in ancient documents. Including but not limited to monsters, monsters, gods, ghosts, spirits, demons, immortals and other chaotic gods in Machamp, and even some magical plants.

Brief introduction of Yao Ji APP

In fact, the Classic of Mountains and Seas is also very useful, which also records many immortals and ghosts. Besides, this book is well known, and some of it is borrowed from to the sky kingdom's Shan Hai Jing.

I don't know if you don't know how to name it, but I did it. There are many naming softwares on the Internet. I mainly use an APP called "Named Chinese Studies", and of course there are other useful software.

I hope my answer is helpful to you.